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Occupational hazards: The relationship between workaholism, ADHD, and psychiatric disorders
A few weeks ago, my colleagues and I received a lot of media coverage around the world for our latest study on workaholism that was published in the journal PLoS ONE. The study involved researchers from the University of Bergen (Norway) and Yale University USA) and is probably the largest ever study done on the topic as it included 16,426 working Norwegian adults. Our study got a lot of press attention because we examined the associations between workaholism and a number of different psychiatric disorders.
We found that workaholics scored higher on all the psychiatric symptoms than non-workaholics. For instance we found that among those we classed as workaholics (using the Bergen Work Addiction Scale that we published in the Scandinavian Journal of Psychology four years ago and which I talked about in a previous blog), we found that:
- 32.7% met ADHD (attention-deficit/hyperactivity disorder) criteria (12.7 per cent among non-workaholics).
- 25.6% met OCD (obsessive-compulsive disorder) criteria (8.7 per cent among non-workaholics).
- 33.8% met anxiety criteria (11.9 per cent among non-workaholics).
- 8.9% met depression criteria (2.6 per cent among non-workaholics).
These were all statistically significant differences between workaholics and non-workaholics.
I think a lot of people wondered why we looked at the relationship between workaholism and ADHD to begin with. Firstly, research has consistently demonstrated that Attention-Deficit/Hyperactivity Disorder (ADHD) increases the risk of various chemical and non-chemical addictions. ADHD is prevalent in 2.5–5% of the adult population, and is typically manifested by inattentiveness and lack of focus, and/or impulsivity, and excessive physical activity. Individuals with ADHD may often stop working due to their disorder, and may have trouble in getting work health insurance as they are regarded as a risk group. For this reason, we thought that individuals with ADHD may compensate for this by over-working to meet the expectations required to hold down a job. Although this is a contentious issue, there are a number of reasons why ADHD may be relevant to workaholism.
Firstly, we argued that the inattentive nature of individuals with ADHD causes them to spend time beyond the typical working day (i.e., evenings and weekends) to accomplish what is done by their fellow employees within normal working hours (i.e., the compensation hypothesis). In addition, as they may have a hard time concentrating while at work due to environmental noise and distractions (especially office work in open landscape environments), they might find it easier to work after co-workers have left their working environment or work from home. Their attentive shortcomings may also cause them to overly check for errors on the tasks given, since they often experience careless mistakes due to their inattentiveness. This may cause a cycle of procrastination, work binges, exhaustion, and – in some cases – a fear of imperfection. Although ADHD is associated with lack of focus, such individuals often have the ability to hyper-focus once they find something interesting–often being unable to detach themselves from the task.
Secondly, we argued that the impulsive nature of individuals with ADHD causes them to say ‘yes’ and taking on many tasks without them thinking ahead, and taking on more work than they can realistically handle–eventually leading to workaholic levels of activity. Thirdly, we also argued that the hyperactive nature of individuals with ADHD and the need to be constantly active without being able to relax, causes such individuals to keep on working in an attempt to alleviate their restless thoughts and behaviors. Consequently, work stress might act as a stimulant, and they may choose active (and often multiple) jobs with high pressure, deadlines and activity (e.g., media, sales, restaurant work) – where they have the opportunity to multitask and constantly shift between tasks (e.g., Type-A personality behavior).
In line with this, Type-A personality has often been associated – and sometimes used inter-changeably – with workaholism in previous research. This line of reasoning also relates to the workaholic type portrayed by Dr. Bryan Robinson (in his 2014 book Chained to the desk: A guidebook for workaholics, their partners and children, and the clinicians who treat them), in which he actually denoted “attention-deficit workaholics” (who tend to start many projects but become bored easily and need to be stimulated at all times). His description of the “relentless” type also corresponds well with ADHD symptoms (i.e., unstoppable in working fast and meeting deadlines, often with many projects going on simultaneously). In other words, these types may utilize work pressure to obtain focus, constantly seeking stimulation, crisis, and excitement – and therefore like risky jobs.
Finally, people with ADHD are often mistaken as being lazy, irresponsible, or unintelligent because of their difficulties with planning, time management, organizing, and decision-making. Feeling misunderstood might cause individuals with ADHD to push themselves to prove these misconceptions as wrong – and resulting in an excessive and/or compulsive working pattern. Such individuals are often intelligent, but may feel forced or motivated to start up their own business (i.e., entrepreneurs), as they find it troubling to adjust to standard work schedules or organizational boundaries. Previous research has highlighted that workaholism is prevalent among entrepreneurs and the self-employed. Often failing in other aspects of life (e.g., family), work for such individuals may become even more important to them (e.g., self- efficacy). This is why we hypothesized that ADHD symptoms will be positively associated with workaholism in our study (and that is what we found).
Obsessive-Compulsive Disorder (OCD) is another underlying psychiatric disorder that increases the likelihood of developing an addiction. Full-blown OCD occurs in approximately 2-3% of children and adults, and is commonly manifested by intrusive thoughts and repetitive behaviors of checking, obsessing, ordering, hoarding, washing, and/or neutralizing. It has been suggested that addictive behaviors might represent a coping and/or escape mechanism of OCD symptoms, or as an OCD-behavior that eventually becomes an addiction in itself. Previous workaholic typologies such as those described by Dr. Kimberly Scotti and her colleagues in the journal Human Relations have incorporated the ‘compulsive-dependent’ and ‘perfectionistic’ workaholic types, and some empirical studies have demonstrated that obsessive-compulsive traits are present among workaholics. The OCD tendency of having the need to arrange things in a certain way (i.e., a strong need for control) and obsessing over details to the point of paralysis – may predispose workers with such traits to develop workaholic working patterns. Again we found in our study that OCD symptoms were positively related to workaholism.
It has also been reported that other psychiatric disorders such as anxiety and depression may also increase the risk of developing an addiction. Approximately 30% of people will suffer from an anxiety disorder in their lifetime, and 20% will have at least one episode of depression. These conditions often occur simultaneously, as most people who are depressed also experience acute anxiety. Consequently, anxiety and/or depression can lead to addiction, and vice versa. A number of studies have previously reported a link between anxiety, depression, and workaholism. Furthermore, we know that workaholism (in some instances) develops as an attempt to reduce uncomfortable feelings of anxiety and depression. Working hard is praised and honored in modern society, and thus serves as a legitimate behavior for individuals to combat or alleviate negative feelings – and to feel better about themselves and raise their self-esteem. This is why we hypothesized that there would be a positive association between anxiety, depression, and workaholism (and that is what we found). In relation to our study’s findings as a whole, the lead author of our study (Dr. Cecilie Andreassen) told the world’s media:
“Taking work to the extreme may be a sign of deeper psychological or emotional issues. Whether this reflects overlapping genetic vulnerabilities, disorders leading to workaholism or, conversely, workaholism causing such disorders, remain uncertain…Physicians should not take for granted that a seemingly successful workaholic does not have ADHD-related or other clinical features. Their considerations affect both the identification and treatment of these disorders”.
Our findings clearly highlighted the importance of further investigating neurobiological differences related to workaholic behaviour. Finally, in line with our previous research published two years ago (also in the PLoS ONE journal) using a nationally representative sample, 7.8% of the participants in our latest study were classed as workaholics compared to 8.3% in our previous study.
Dr. Mark Griffiths, Professor of Behavioural Addiction, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Further reading
Andreassen, C.S., Griffiths, M.D., Hetland, J., Kravina, L., Jensen, F., & Pallesen, S. (2014). The prevalence of workaholism: A survey study in a nationally representative sample of Norwegian employees. PLoS ONE, 9(8): e102446. doi:10.1371/journal.pone.0102446.
Andreassen, C.S., Griffiths, M.D., Hetland, J. & Pallesen, S. (2012). Development of a Work Addiction Scale. Scandinavian Journal of Psychology, 53, 265-272.
Andreassen, C.S., Griffiths, M.D., Sinha, R., Hetland, J. & Pallesen, S. (2016). The relationships between workaholism and symptoms of psychiatric disorders: A large-scale cross-sectional study. PLoS ONE, 11(5): e0152978. doi:10.1371/journal. pone.0152978.
Griffiths, M.D. (2005). Workaholism is still a useful construct. Addiction Research and Theory, 13, 97-100.
Griffiths, M.D. (2011). Workaholism: A 21st century addiction. The Psychologist: Bulletin of the British Psychological Society, 24, 740-744.
Griffiths, M.D. & Karanika-Murray, M. (2012). Contextualising over-engagement in work: Towards a more global understanding of workaholism as an addiction. Journal of Behavioral Addictions, 1(3), 87-95.
Karanika-Murray, M., Duncan, N., Pontes, H. & Griffiths, M.D. (2015). Organizational identification, work engagement, and job satisfaction. Journal of Managerial Psychology, 30, 1019-1033.
Karanika-Murray, M., Pontes, H.M., Griffiths, M.D. & Biron, C. (2015). Sickness presenteeism determines job satisfaction via affective-motivational states. Social Science and Medicine, 139, 100-106.
Orosz, G., Dombi, E., Andreassen, C.S., Griffiths, M.D. & Demetrovics, Z. (2016). Analyzing models of work addiction: Single factor and bi-factor models of the Bergen Work Addiction Scale. International Journal of Mental Health and Addiction, in press
Quinones, C. & Griffiths, M.D. (2015). Addiction to work: recommendations for assessment. Journal of Psychosocial Nursing and Mental Health Services, 10, 48-59.
Quinones, C., Griffiths, M.D. & Kakabadse, N. (2016). Compulsive Internet use and workaholism: An exploratory two-wave longitudinal study. Computers in Human Behavior, 60, 492-499.
Robinson, B.E. (2014). Chained to the desk: A guidebook for workaholics, their partners and children, and the clinicians who treat them. New York: New York University Press.
Scotti, K.A., Moore, K.S., & Miceli, M.P. (1997). An exploration of the meaning and consequences of workaholism. Human Relations, 50, 287–314.
Shonin, E., Van Gordon, W., & Griffiths M.D. (2014). The treatment of workaholism with Meditation Awareness Training: A case study. Explore: Journal of Science and Healing, 10, 193-195.
Sussman, S., Lisha, N. & Griffiths, M.D. (2011). Prevalence of the addictions: A problem of the majority or the minority? Evaluation and the Health Professions, 34, 3-56.
Give me strength: Muscle Dysmorphia as an addiction
Muscle Dysmorphia (MD) describes a condition characterised by a misconstrued body image in individuals interpret their body size as both small and weak even though they may look normal or even be highly muscular. Those experiencing the condition typically strive for maximum fat loss and maximum muscular build. MD can have potentially negative effects on thought processes including depressive states, suicidal thoughts, and in extreme cases, suicide attempts. These negative psychological states have also been linked with concurrent use of Appearance and Performance Enhancing Drugs (APED) including Anabolic Androgenic Steroids (AAS).
MD was originally categorised in 1993 by Dr. H.G. Pope and colleagues (in the journal Comprehensive Psychiatry) as Reverse Anorexia Nervosa, due to characteristic symptoms in relation to body size. It has been considered to be part of the spectrum of Body Dysmorphic Disorders (BDD) referring to a range of conditions that tap into issues surrounding body image and eating behaviours. Consequently, there is a lack of consensus amongst researchers whether MD is a form of BDD, Obsessive-Compulsive Disorder (OCD) or a type of eating disorder. Earlier this year, Andy Foster, Dr. Gillian Shorter and I published a paper in the Journal of Behavioral Addictions about the ‘Addiction to Body Image’ model, and arguing that MD could perhaps be conceptualized as an addiction.
Our ‘Addiction to Body Image’ (ABI) model attempts to provide an operational definition and to introduce a standard assessment across the research area. The ABI model uses my addiction components model (outlined is a previous blog) as the framework in which to define muscle dysmorphia as an addiction. For the purposes of our paper, body image was defined using Sarah Grogan’s definition (from her 2008 book Body image: Understanding body dissatisfaction in men, women, and children) who said it was a person’s “perceptions, thoughts and feelings about his or her body”. We argued that the addictive activity in MD is the maintaining of body image via a number of different activities such as bodybuilding, exercise, eating certain foods, taking specific drugs (e.g., anabolic steroids), shopping for certain foods, food supplements, and/or physical exercise accessories, etc.).
In the ABI model, the perception of the positive effects on the self-body image is accounted for as a critical aspect of the MD condition. The maintenance behaviours of those with ABI may include healthy changes to diet or increases in exercise. However, such behaviours can hide or mislead those with ABI away from the negative thought processes that are driving their addiction. It is in the cognitive dysfunction of MD where we believe there is a pathological issue, and why the field has encountered problems with the criteria for the condition. The attempt to explain MD in the same manner as other BDDs may not be adequate due to the cognitive dysfunction occurring in the context of the potentially positive physical effects via improvements in shape, tone, and/or health of the body.
We also argued that there is a difference in the cognitive dysfunction with a misconstrued self-body image compared to other BDDs. The cognitive dysfunction causes the individual with MD to have a misconstrued view of their own body image, and the person believes they are small and puny. This negative mindset has the potential to cause depression and other disorders, and may facilitate the addiction. Unlike other conceptualizations of MD in the BDD literature, we would argue that the agent of the addiction is the perceived body image that is maintained by engaging in secondary behaviours such as specific types of physical activity and food. The most important thing in the life of someone with MD is how their body looks (i.e., their body image). The behaviours that the person with MD engages in (such as excessive exercise or disordered eating) are merely the vehicles by which their addiction (i.e., their perceived body image) is maintained.
Based on empirical evidence to date, we proposed that Muscle Dysmorphia could be re-classed as an addiction due to the individual continuing to engage in maintenance behaviours that cause long-term psychological damage. More research is needed to explore the possibilities of MD as an addiction, and how this particular addiction is linked to substance use and/or other comorbid health conditions. Controversy about the conceptual measurement of the condition, has led to a number of different scales adapted from different criteria that may not fully measure the experience of MD.
However, a group of questions that might test the applicability of the ABI approach to measuring and conceptualising MD have not been asked. Questionnaires such as the Exercise Addiction Inventory and the Bergen Work Addiction Scale (two scales that I co-developed) could be adapted to fit MD characteristics. Adequate conceptualisation is key to explore the clinically relevant condition. This new ABI approach may also have implications for diagnostic systems around similar conditions such as other BDDs or eating disorders.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Additional input: Andy Foster and Dr. Gillian Shorter
Further reading
Andreassen, C.S., Griffiths, M. D., Hetland, J. & Pallesen, S. (2012). Development of a Work Addiction Scale. Scandinavian Journal of Psychology, 53, 265-272.
Foster, A.C., Shorter, G.W.& Griffiths, M.D. (2014). Muscle Dysmorphia: Could it be classified as an Addiction to Body Image? Journal of Behavioral Addictions, in press.
Griffiths, M.D. (1997). Exercise addiction: A case study. Addiction Research, 5, 161-168.
Griffiths, M. D. (2005). A ‘components’ model of addiction within a biopsychosocial framework. Journal of Substance Use, 10, 191-197.
Griffiths, M. D., Szabo, A., & Terry, A. (2005). The Exercise Addiction Inventory: A quick and easy screening tool for health practitioners. British Journal of Sports Medicine, 39, 30-31.
Grogan, S. (2008). Body image: Understanding body dissatisfaction in men, women, and children. London: Routledge.
Mosley, P.E. (2009). Bigorexia: Bodybuilding and muscle dysmorphia. European Eating Disorders Review. 17, 191-198.
Murray, S. B., Rieger, E., Touyz, S. W., & De la Garza Garcia, Y. (2010). Muscle Dysmorphia and the DSM-V Conundrum: where does it belong? International Journal of Eating Disorders, 43, 483-491.
Nieuwoudt, J. E., Zhou, S., Coutts, R. A., & Booker, R. (2012). Muscle dysmorphia: Current research and potential classification as a disorder. Psychology of Sport and Exercise, 13, 569-577.
Olivardia, R. (2001). Mirror, mirror on the wall, who’s the largest of them all? The features and phenomenology of muscle dysmorphia. Harvard Review of Psychiatry, 9, 254–259.
Phillips, K. A. & Hollander, E. (1996). Body dysmorphic disorder.In T.A. Widige, A.J. Frances, H.A. Pincus, R. Ross, M.B. First, & W.W. Davis, Eds. DSM-IV Sourcebook, Volume 2. Washington DC: American Psychiatric Association.
Philips, K. A., Gunderson, C. G., Mallya, G., McElroy, S. L., & Carter, W. (1998). A comparison study of body dysmorphic disorder and obsessive-compulsive disorder. Journal of Clinical Psychiatry, 59, 568–575.
Pope, H. G., Jr., Gruber, A. J., Choi, P., Olivardia, R., & Phillips, K. A. (1997). Muscle dysmorphia. An underrecognised form of body dysmorphic disorder. Psychosomatics, 38, 548–557.
Pope, H. G., Jr., Katz, D. L., & Hudson, J. I. (1993). Anorexia nervosa and ‘‘reverse anorexia’’ among 108 male bodybuilders. Comprehensive Psychiatry, 34, 406–409.
Pope, C. G., Pope, H. G., Menard, W., Fay, C., Olivardia, R., & Phillips, K.A. (2005). Clinical features of muscle dysmorphia among males with body dysmorphic disorder. Body image, 2, 395-400.
Veale, D. (2004) Body dysmorphic disorder. Postgraduate Medical Journal. 80, 67-71.
Duly noted: A brief overview on compulsive singing
In a number of previous blogs I have made reference to the fact that I am a music obsessive. One of the consequences of my insatiable desire for music is that I often find myself unconsciously singing (either along with the music itself or just spontaneously as the mood takes me). Although I do not believe I have a compulsion to break into song, I was surprised to find that there are a number of case studies in the psychological literature on compulsive singing and other music related compulsions such as compulsive humming and whistling (although these all appear to be consequences of other underlying conditions). As noted in a previous blog, compulsive behaviour typically involves a repetitive and irresistible urge to perform a particular action (or set of actions) where the person feels they have no control to inhibit or stop the habitual behaviour. Compulsivity is part of obsessive-compulsive disorder (OCD), but may occasionally occur as stand-alone symptom following the onset of various physiological disorders.
One of the earliest papers I came across on the phenomenon was by Dr. Daniel Jacome in a 1984 issue of the Journal of Neurology, Neurosurgery and Psychiatry. Dr. Jacome described the case of a “musically naive patient with dominant fronto-temporal and anterior parietal infarct developed transcortical mixed aphasia. From early convalescence, he exhibited elated mood with hyperprosody and repetitive, spontaneous whistling and whistling in response to questions”. In addition to the whistling, Jacome also reported that the individual spontaneously sang without any error in melody, lyrics, pitch, and rhythm. The man also developed the desire to spend long periods of time listening to music.
Compulsive whistling was also reported in a 2012 issue of BMC Psychiatry by Dr. Rosaura Polak and her colleagues. Their paper reported the case of a 65-year-old man who started whistling compulsively following a heart attack. The heart attack had caused some brain damage due to a lack of oxygen to the brain. Prior to the cardiac arrest, the man had never displayed any obsessive-compulsive symptoms or psychiatric complaints. He was treated with clomipramine (a seretonin reuptake inhibitor) and this decreased time spent compulsively whistling. The authors concluded that:
“This case shows that the whistling can be explained in the context of compulsivity with its repetitive character. It illustrates that the compulsive behavior can be present as an independent symptom of cortico-striatal dysfunction, and may not always belong to frontal syndrome, punding or OCD. Finally, this case illustrates that pharmacological treatment with clomipramine is effective and suggests that similar cases of compulsivity may benefit from this treatment”
A paper published in a 2000 issue of the Journal of the Korean Neurological Association examining 25 patients with fronto-temporal dementia (20 women and five men with an average age of 56 years) noted that compulsive behaviour is one of the commonest early manifestations of the condition. The researchers analyzed their symptoms and compulsive behaviours and 22 of the patients (88%) showed various compulsive behaviours including “reading signboards, stereotypy of speech, ordering, hoarding, washing, checking, counting, singing, and wandering a fixed route”. However, no real detail was provided in relation to the compulsive singing. Other papers – such as one in a 2002 issue of European Psychiatry by Dr. F. Muratori and colleagues – have reported compulsive singing in people that have Kleine-Levin syndrome (i.e., recurrent primary hypersomnia where individualscan lapse into a deep sleep at any time without warning, sometimes lasting as long as 16 hours).
One of the most interesting and detailed papers on compulsive singing is a 2007 paper by Dr. Christophe Bonvin and colleagues in the Annals of Neurology. They reported two case studies of individuals with advanced Parkinson’s disease who exhibited “a peculiar and stereotyped behavior characterized by an irrepressible need to sing compulsively when under high-dose dopamine replacement therapy”. They argued that the compulsive singing behaviour shared many features with punding (i.e., repetitive behaviour that is a side effect of some drugs). Here is a brief summary of the two cases:
Patient 1: “A 70-year-old female university professor and amateur piano player while being treated with 1,268 L-dopa equivalent units (LEU)…exhibited a repetitive, compulsive behavior characterized by singing endlessly…It started with an irrepressible urge to hum the rhythm and then the main melody of Francesca di Foix, a jocular opera written in 1831 by Gaetano Donizetti. She had heard this rarely produced piece in Milan years ago, and although she did not particularly like it, she had an obsessive need to repeat this song again and again for hours. Even though it was disruptive, preventing sleep and social interactions, singing was reported as pleasant and associated with a feeling of calmness and relief. If interrupted, she became irritated…All symptoms improved minimally after quetiapine (25mg twice daily) had been introduced”.
Patient 2: “A 71-year-old male painter…[that] grew up in a family of musicians and used to spend time listening to classical music and singing willingly…While being treated with 634 LEU, he started to hum repeatedly the same melody, initially once a week, then several times daily, mostly in the evening…Although he asserted singing exclusively Mozart’s 7th Serenade (‘Haffner’ KV 250), his wife reported also about 10 different poorly elaborated songs. This stereotyped behavior was reported as irrepressible and gave him a sensation of relief and ‘peace of mind’. On demand, he could stop singing for short periods but felt somewhat frustrated, demonstrating some aggressive behavior toward his spouse. There were no concomitant auditory or visual hallucinations. This phenomenon exacerbated dramatically when LD/benserazide was increased to 1,000/250mg daily (1134 LEU)…[This resulted in] the patient losing control over the compulsion and singing almost unendingly all day…Eventually, compulsive singing improved, but did not disappear, when LD/benserazide was reduced to the minimal daily doses (500/125mg)”.
The authors noted that in both of these patients developed a peculiar, stereotyped, and compulsive behaviour characterized by an urge to sing repeatedly the same song. They also concluded that in both cases:
“[The] compulsive singing developed as an isolated, elaborate, and selective feature, unrelated to mania or psychosis…Although the singing behavior was fully recognized by both patients as inadequate and socially disruptive, they were unable to stop singing for more than a few seconds to minutes, partly because the singing-induced sensation of pleasure felt was overwhelming. To the best of our knowledge, this phenomenon has not been consistently identified in [Parkinson’s disease] thus far…Moreover, PET and functional magnetic resonance imaging studies conducted in humans have correlated pleasure and reward from music listening with a significant activation of the ventral tegmental area and accumbens nucleus, as well as of the hypothalamus, insula, and orbitofrontal cortex. These findings suggest that music listening may recruit similar neural circuitry of reward and emotions as other pleasure inducing stimuli like food and sex, and this may also be the case for singing”.
In 2010, Dr. Hiroshi Kataoka and Dr. Satoshi Ueno described the case of an 82-year old woman (also with Parkinson disease) who started to sing compulsively (in the absence of any other types of pathologic behaviour) following treatment with pergolide. In the journal Cognitive and Behavioral Neurology, the authors reported that she would hum the same melody and sing songs repeatedly. When she stopped taking her ergolide medication, the compulsive singing and humming considerably subsided. Drs. Kataoka and Ueno suggested that a dopamine agonist in the patient’s medication may have contributed to her compulsive singing. The same phenomenon was also reported in three Parkinson’s patients treated with dopamine agonists by a Dr. C. Borrue-Fernandez at a Spanish conference on treating Parkinson’s disease in 2011.
It would appear from the few papers that have been published on compulsive singing that it almost always occurs alongside or as a consequence of other primary medical conditions and that some excessive or sensitized dopaminergic stimulation is a necessary prerequisite for such musical stereotypies to occur.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Further reading
Bonvin, C., Horvath, J., Christe, B., Landis, T., & Burkhard, P. R. (2007). Compulsive singing: another aspect of punding in Parkinson’s disease. Annals of Neurology, 62, 525-528.
Borrue-Fernandez, C. (2011). Compulsive singing as an Impulse Control Disorder in dopamine agonist treated patients: Review of three cases. The 15th Congress of the European Federation of Neurological Societies.
Jacome, D. E. (1984). Aphasia with elation, hypermusia, musicophilia and compulsive whistling. Journal of Neurology, Neurosurgery and Psychiatry, 47, 308-310.
Kataoka, H., & Ueno, S. (2010). Compulsive singing associated with a dopamine agonist in Parkinson disease. Cognitive and Behavioral Neurology, 23(2), 140-141.
Muratori, F., Bertini, N., & Masi, G. (2002). Efficacy of lithium treatment in Kleine–Levin syndrome. European Psychiatry, 17, 232–3.
Polak, A. R., van der Paardt, J. W., Figee, M., Vulink, N., de Koning, P., Olff, M., & Denys, D. (2012). Compulsive carnival song whistling following cardiac arrest: a case study. BMC Psychiatry, 12(1), 75.
Yoon, S. J., Jeong, J. H., Kang, S. J., & Na, D. L. (2000). Compulsive behaviors and presenting symptoms of frontotemporal dementia. Journal of the Korean Neurological Association, 18, 681-686
The need in deed: Is ‘loss of control’ always a consequence of addiction?
I recently published a potentially controversial paper in the journal Frontiers in Psychiatry arguing that loss of control may not always be a natural consequence of addiction. Research into addiction has a long history although there has always been much debate as to what the key components of addiction are. Irrespective of the theory and model of addiction, most theorizing on addiction tends to assume (implicitly or explicitly) that ‘loss of control’ is central (if not fundamental) to addiction. My paper challenges such notions by arguing that there are a minority of individuals who appear to be addicted to a behaviour (i.e., work) but do not necessarily appear to display any loss of control.
Research into many different types of addiction has shown that addicts are not a homogeneous group, and this may also have implications surrounding control and loss of control. Many years ago, in my 1995 book Adolescent Gambling, I argued that in relation to problem gambling there appear to be at least two sub-types of addiction – primary addictions and secondary addictions. I defined primary addictions as those in which a person is addicted to the activity itself, and that individuals love engaging in the activity whether it is gambling, sex or playing video games. Here, the behaviour is primarily engaged in to get aroused, excited, and/or to get a ‘buzz’ or ‘high’. I defined secondary addictions as those in which the person engages in the behaviour as a way of dealing with other underlying problems (i.e., the addiction is symptomatic of other underlying problems). Here the behaviour is primarily engaged in to escape, to numb, to de-stress, and/or to relax.
Therapeutically, I argued that it is easier to treat secondary addictions. My argument was that if the underlying problem is addressed (e.g., depression), the addictive behaviour should diminish and/or disappear. Primary addicts appear to be more resistant to treatment because they genuinely love the behaviour (even though it may be causing major problems in their life). Furthermore, the very existence of primary addictions challenges the idea that loss of control is fundamental to definitions and concepts of addiction. Clearly, people with primary addictions have almost no desire to stop or cut down their behaviour of choice because it is something they believe is life affirming and central to the identity of who they are. But does lack of a desire to stop the behaviour they love prevent ‘loss of control’ from occurring? Arguably it does, particularly when examining the research on workaholism.
I have popularized the ‘addiction components model’, particularly in relation to behavioural addiction (i.e., non-chemical addictions that do not involve the ingestion of a psychoactive substance). The addiction components model operationally defines addictive activity as any behaviour that features what I believe are the six core components of addiction (i.e., salience, mood modification, tolerance, withdrawal symptoms, conflict and relapse, and which I outlined in my very first blog on this site)
One of the observations that can be made by examining these six criteria is that ‘loss of control’ is not one of the necessary components for an individual to be defined as addicted to an activity. Although I acknowledge that ‘loss of control’ can occur in many (if not most) addicts, loss of control is subsumed within the ‘conflict’ component rather than a core component in and of itself. The main reason for this is because I believe that there are some addictions – particularly behavioural addictions such as workaholism – where the person may be addicted without necessarily losing control. However, such a claim depends on how ‘loss of control’ is defined and the highlights the ambiguity in our standard understanding of addiction (i.e., the ambiguity of control as ability/means versus control as goal/end).
When theorists define and conceptualise ‘loss of control’ as applied to addictive behaviour, it typically refers to (i) the loss of the ability to regulate and control the behaviour, (ii) the loss of ability to choose between a range of behavioural options, and/or (iii) the lack of resistance to prevent engagement in the behaviour. In some behaviours such as workaholism and anorexia, the person arguably tries to achieve control in some way (i.e., over their work in the case of a workaholic, or over food in the case of an anorexic). However, this in itself is not a counter-example to the idea that addiction is a ‘loss of control’ if workaholics and anorexics have lost the ability to control other aspects of their day-to-day lives in their pursuit of control over work or food (i.e., there is a difference between control as the goal/end of behaviour, and control as an ability/means.
There is an abundance of research indicating that one of the key indicators of workaholism (alongside such behaviours as high performance standards, long working hours, working outside of work hours, and personal identification with the job) is that of control of work activities. In a recent paper I wrote with my colleague Dr. Maria Karanika-Murray in the Journal of Behavioral Addictions, we also noted that the need for control is high among workaholics, and as a consequence they have difficulty in disengaging from work leading to many other negative detrimental effects on their life such as relationship breakdowns. Even some of the instruments developed to assess workaholism utilize questions concerning the need to be in control.
There are also other studies that suggest some workaholics do not experience a ‘loss of control’ in the traditional sense that is used elsewhere in the addiction literature. For instance, in a 2004 issue of the Journal of Organizational Change Management, Dr. Peter Mudrack reported that two particular aspects of obsessive-compulsive personality (i.e., being stubborn and highly responsible) were predictive of workaholism. A very recent paper by Dr. Ayesha Tabassum and Dr. Tasnuva Rahman in the International Journal of Research Studies in Psychology noted that perfectionist workaholics experience an overbearing need for control and are very scrupulous and detail-oriented about their work. Unusually among addictions, workaholics usually have no desire to reduce or regulate their work behaviour (i.e., there is no ambivalence or conflicting desire for them). In this instance, there is no evidence of ‘loss of control’ as traditionally understood, because if they had ambivalent or conflicting desires, they would change their behaviour (i.e., reduce the amount of time they spend working). Although not an exhaustive list of studies, those mentioned here appear to indicate that some workaholics appear to be more in control than not in control.
When the addiction is primary, the goal/end of the behaviour is desired and/or endorsed without ambivalence by the addict. In these situations (as in some cases of workaholism), there is no evidence for loss of control, because no (failed) attempts are made by the addict to alter their behaviour. However, this could arguably still be compatible with the claim that there is loss of control in the sense of ability and/or means, because, if the workaholic tried to work less (or work in a less controlling way) because they started to recognize ill effects the addictive behaviour was having on their personal life, then they may fail to do so. Therefore, the lack of evidence is indicative rather than conclusive.
However, one of the reasons that workaholism raises interesting theoretical and conceptual issues concerning the loss of control is that it is an example of an addiction where the goal/end is itself a form of control (i.e., control over their productivity/outputs, control over others, control over time-keeping, etc.). Unlike many other addictions, such behaviour is not impulsive and/or chaotic but carefully planned and executed. So this raises the question, in what sense is workaholism a loss of control, understood in the typical way, as ability/means to the behaviour’s goal/end? In some cases of workaholism, there is no evidence that the workaholic lacks control over this goal/end, as they do not try to change their behaviour (and thus cannot fail to do so).
It could be argued – and this is admittedly speculative – that ‘loss of control’ as is traditionally understood appears to have a greater association with secondary addiction (i.e., where an individual’s addiction is symptomatic of other underlying problems) than primary (or ‘happy’ or ‘positive’) addiction (i.e., where an individual feels totally rewarded by the activity despite the negative consequences). Such a speculation has good face validity but needs empirical testing. However, a complicating factor is the fact that my studies on adolescent gambling addicts have demonstrated that some individuals start out as primary addicts but became secondary addicts over time. Again, this suggests that control (and loss of it) may be something that changes its nature over time.
In essence, workaholics appear to make poor choices and/or decisions that have wide-reaching detrimental consequences in their lives. However, at present we lack evidence that (should they decide otherwise) they would be unable to work in a more healthy way. Furthermore, and equally as important, the nature of workaholic behaviour is not impulsive and chaotic, but carefully planned and executed. This is particularly striking among some workaholics, because as I have noted, it is an addiction that for some individuals they continue to work happily despite objectively negative consequences (e.g., relationship breakdowns, neglect of parental duties, etc.). What the empirical research on workaholism suggests is that it is an example of an addiction in which the problem is better characterized as loss of prudence rather than loss of control, as traditionally understood.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Further reading
Andreassen, C.S., Griffiths, M.D., Hetland, J. & Pallesen, S. (2012). Development of a Work Addiction Scale. Scandinavian Journal of Psychology, 53, 265-272.
Andreassen, C. S., Torsheim, T., Brunborg, G. S., & Pallesen, S. (2012) Development of a Facebook addiction scale. Psychological Reports, 110, 501-517.
Griffiths, M.D. (1995). Adolescent Gambling. London: Routledge.
Griffiths, M.D. (2005). A ‘components’ model of addiction within a biopsychosocial framework. Journal of Substance Use, 10, 191-197.
Griffiths, M.D. (2011). Workaholism: A 21st century addiction. The Psychologist: Bulletin of the British Psychological Society, 24, 740-744.
Griffiths, M.D. & Karanika-Murray, M. (2012). Contextualising over-engagement in work: Towards a more global understanding of workaholism as an addiction. Journal of Behavioral Addictions, 1(3), 87-95.
Mudrack, P.E. (2004). Job involvement, obsessive-compulsive personality traits, and workaholic behavioral tendencies. Journal of Organizational Change Management, 17, 490-508.
Mudrack, P.E. & Naughton, T.J. (2001) The assessment of workaholism as behavioral tendencies: Scale development and preliminary empirical testing. International Journal of Stress Management, 8, 93-111.
Tabassum, A. & Rahman, T. (2012). Gaining the insight of workaholism, its nature and its outcome: A literature review. International Journal of Research Studies in Psychology, 2, 81-92.
Better collate than never: Can collecting be an addiction?
In a previous blog on bibliomania (i.e., an obsessive-compulsive disorder associated with the collecting and hoarding of books), I briefly mentioned that collecting more generally could perhaps be addictive for some people. Writing in a 2006 issue of the International Journal of Psychoanalysis, Dr. Peter Subkowski wrote that the urge to collect is a ubiquitous phenomenon that has anthropological, sociobiological, and individual psychodynamic roots. Dr. Russell Belk writing in a 1991 issue of the Journal of Social Behavior and Personality described collectors of mass-produced objects as falling into one of two main types: the taxonomic collector who attempts to own an example of every type of a series of items produced, and the aesthetic collector who simply gathers items because they are pleasing in some way.
So what are the motivations for collecting? In a 1991 issue of the Journal of Social Behavior and Personality, Dr. Ruth Formanek suggested five common motivations for collecting. These were: (i) extension of the self (e.g., acquiring knowledge, or in controlling one’s collection); (ii) social (finding, relating to, and sharing with, like-minded others); (iii) preserving history and creating a sense of continuity; (iv) financial investment; and (v), an addiction or compulsion. Formanek claimed that the commonality to all motivations to collect was a passion for the particular things collected. One of the prime researchers in the ‘collecting’ field is Dr. Russell Belk who has written many papers and chapters on the topic. In a 1991 book chapter, Dr. Belk (along with Melanie Wallendorf, John F. Sherry, Jr., and Morris B. Holbrook) noted that:
“In examining literary and social science treatments of collecting…some regard it as a passion, others as a disease. It is frequently described as a pleasurable activity that can have some unpleasant consequences. In its pleasurable aspect, collecting embodies the characteristics of flow…It is an optimal experience that is psychologically integrating and socially beneficial. In its darker aspect, collecting is an activity over which many consumers fear losing control. Whether likened to idolatry or illness, collectors acknowledge the very real possibility that collecting can become addictive. Danet and Katriel (1990) suggest that the seemingly self-deprecating admission of addiction to one’s collection can be a way of disclaiming responsibility for uninhibited collecting. At the same time they recognize that ‘serious’ collectors relish their ability to freely express passion in their collecting activity. What apparently is being negotiated in the area between passion and addiction is the definition of whether the collector controls or is controlled by the activity of collecting”.
The chapter also claimed that the tendency to pursue an altered state of consciousness produced by any ritual activity “whether behaviorally via collecting, or pharmacologically via chemical use” is cross-culturally universal. Obviously they acknowledged that most collectors are not addicts but claimed there was “compelling evidence of its pervasiveness in the observations of others” based in self-report surveys, and the labels by which collectors in their research studies described themselves (e.g., “magazineaholic”, “getting a Mickey Mouse fix”, “print Junkie”). Brenda Danet and Tamara Katriel claimed some of their collectors’ said it was “a disease”. They also reported that Sigmund Freud amassed a large collection of 2,300 Roman, Greek, Egyptian, Assyrian, and Chinese antiquities that eventually numbered approximately 2300 and described his collecting passion as “an addiction second in intensity only to his nicotine addiction“. Based on their interviews with collectors, the chapter then went on to claim:
“Although almost any behavior can become addictive, the pattern of behavior characteristic of collectors makes it especially prone to addiction. Most collectors interviewed mentioned the search for additions to a collection as the central activity of their collecting behavior. Rather than spend time examining or organizing items that are already in the collection, collectors prefer to search or shop for additions to the collection. Search behavior may be compulsively and ritualistically enacted. Acquiring rather than possessing provides the temporary fix for the addict. A sense of longing and desire — a feeling that something is missing in life — is temporarily met by adding to the collection. But this is a temporary fix, a staving off of withdrawal, followed by a feeling of emptiness and anxiety that is addressed by searching for more. Shopping and searching are the ritualized means by which the collector obtains a sense of competence and mastery in life. These activities are the bittersweet consequences of experiencing longing in the arena of the marketplace”.
They also noted that searching and shopping for collection items highlight the ritualized aspects (i.e., it is patterned and repetitive). They provided the example of a Barbie doll collector that spent considerable time at doll shows that had specific rules that guided his doll buying (e.g., having the dealer completely undress then redress the doll to allow him to see if any part of the body is damaged). They also reported that items for their collection found in the search were often seen as having irresistible power over the person. One collector of antique bronzes was quoted as saying “I just had to have it. It had to be mine”. Searching for such items are “not the only addictive focus for collectors”. Belk and colleagues reported that:
“Compulsive attention to and control over the objects in the collection provides an additional source of feelings of control and mastery –important feelings to an addict. For example, one interpretation of the propensity of collectors to will their collections to museums is that, by doing so, they retain a certain sense of control of the collection by insuring that it will not fall into the hands of another collector. Collecting activity allows a collector to avoid other aspects of life. It is a form of withdrawal from other aspects of life that is nevertheless often positively sanctioned…On the whole, collecting, particularly for the addict, involves the individual in a repetitive, predictable pattern of behavior which can provide a form of solace for someone who is troubled by living in an unpredictable world”.
In a 1995 paper in the Journal of Economic Psychology, Dr. Belk carried out in-depth interviews with 200 collectors. He claimed that for most, collecting was a highly beneficial activity. However, he also noted there were extreme cases where collecting was found to be addictive and dysfunctional for the affected individuals and their families. He also wrote that:
“Collectors often refer to themselves, only half in jest, as suffering from a mania, a madness, an addiction, a compulsion, or an obsession. Because collecting is generally a socially approved activity, no one is likely to treat such a confession as stigmatizing in the way that it would be for an alcoholic, a heroin addict, a compulsive gambler, or someone truly believed to be mentally ill…But like much humor there is an uneasy fear behind these self-admissions, for some collectors really are out of control”.
The most vivid example that Belk encountered was a dealer and collector of Disney cartoon character replicas who was a recovering poly-drug abuser who himself described his collecting behaviour as an addiction. Over many years, he accumulated a large collection of Mickey Mouse memorabilia to obtained his “Mickey fix”. Consequently he was often unable to pay his house rent or pay his bills. Belk claimed that he thrill of collecting and displaying his objects eventually threatened his psychological wellbeing and in the collector’s words had to go “cold turkey” and cease collecting.
Finally, in an online article about addictive collecting, Hale Dwoskin, CEO and director of training of Sedona Training Associates provided a list of symptoms of a collecting addiction:
- You look for/buy/trade collectibles for hours on end, and the time you spend doing this is increasing
- You think about collectibles constantly, even when you’re not collecting
- You have missed important meetings/events because of collecting
- It’s difficult for you to not buy more collectibles, even for just a few days
- You try to sneak more collectibles into your home
- You have tried, unsuccessfully, to stop collecting
- Your family or friends have asked you to cut back on collecting
- Your personal interests have changed because of your collecting
- You have lost a personal or professional relationship because of collecting
As an ‘avid’ collector myself (of records, CDs and music in general) I can certainly see how collecting can become an expensive habit that goes beyond disposable income. Although I think that it is theoretically possible to be addicted to collecting, the number of genuine ‘collecting addicts’ is likely to be very low.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Further reading
Belk, R. W. (1982). Acquiring, possessing, and collecting: fundamental processes in consumer behavior. Marketing Theory: Philosophy of Science Perspectives, 185-190.
Belk, R. W. (1992). Attachment to possessions. In: Place attachment (pp. 37-62). New York: Springer.
Belk, R. W. (1994). Collectors and collecting. Interpreting objects and collections, 317-326.
Belk, R. W. (1995). Collecting as luxury consumption: Effects on individuals and households. Journal of Economic Psychology, 16(3), 477-490.
Belk, R.W., Wallendorf, M., Sherry, J.F., & Holbrook, M.B. (1991). Collecting in a consumer culture. In: Highways and buyways: Naturalistic research from the consumer behavior odyssey, pp.178-215.
Danet, B. & Katriel, T. (1989). No two alike: The aesthetics of collecting. Play and Culture, 2, 253-277.
Formanek, R. (1991). Why they collect: Collectors reveal their motivations. Journal of Social Behavior and Personality, 6(6), 275-286.
MacLeod, K. (2007). Romps with Ransom’s King: Fans, Collectors, Academics, and the MP Shiel Archives. ESC: English Studies in Canada, 30(1), 117-136
Subkowski, P. (2006). On the psychodynamics of collecting. International Journal of Psychoanalysis, 87, 383-401.
What’s bugging you? A beginner’s guide to Ekbom’s syndrome
It was only a few months ago that I watched the 2006 film Bug for the very first time. Directed by William Friedkin, it tells the story of a mentally ill drifter called Peter Evans (with a great performance by Michael Shannon). Evans ends up having a sexual relationship with Agnes White, a bisexual alcoholic junkie (played surprisingly well by Ashley Judd). During the film, Peter confides in Agnes his belief that he has a colony of microscopic bugs infested one of his molar teeth (and then in one ‘memorable’ scene starts pulling his own teeth out). Evans’ paranoia becomes increasingly erratic and becomes a shared belief with White (who also comes to believe that they are both infested with microscopic bugs; this sharing of a delusional belief is known as a ‘folie à deux’ [French for ‘a madness shared by two people’, a shared psychosis] and would make a good blog topic). However, today’s blog focuses on imagined bug infestation (i.e., delusional parasitosis) that is known in psychological and psychiatric terms as Ekbom’s syndrome (named after the Swedish neurologist Karl Ekbom who first described the condition in a number of published papers in the late 1930s).
As you have probably gathered from my quick film synopsis above, Ekbom’s syndrome (ES) is a type of psychosis in which sufferers have a vehement delusional belief that they are infested with parasites that those affected describe as bugs or insects crawling around under their skin (when in reality they simply do not exist). I ought to add that the characters in Bug also appeared to be suffering from ‘delusory cleptoparasitosis’ (DC) another type of insect psychosis in which the sufferer thinks the place where they live is infested with parasites (rather than from within their body). As a consequence, both ES and DC sufferers are more likely to seek the help of skin specialists (e.g., dermatologists) and insect specialists (e.g., pest control, entomologists) than psychologists.
In essence, ES is a tactile hallucination and is also known as ‘formication’ (which is the word that describes the feeling of insects crawling and/or burrowing underneath the skin’s surface. Formication is also one form of parasthaesia (of which other examples include the ‘pins and needles’ tingling sensations that many people experience regularly). Parasthaesia includes any non-permanent skin sensation including tickling, pricking, tingling, numbness, and/or burning. ES sufferers will focus on any unusual body mark on their skin as ‘evidence’ that they have a parasitic infection. It is not uncommon for obsessive and/or compulsive checking of the body to occur. The prevalence of ES is unknown although Dr. J. Koo and Dr. C. Gambla reported in the journal Dermatologic Clinic that they see around 20 new cases per year in the large US referral clinic.
In some psychological circles, ES has been used synonymously with Wittmaack-Ekbom syndrome that is more associated with ‘restless leg syndrome’ (RLS; something that I myself have suffered from due to a chronic spinal condition that I have). When I get my bouts of RLS, it really does feel as though I have tiny insects moving about inside my right leg. The difference between ES and RLS is that RLS is a real physical condition that has bona fide physical basis whereas the basis for ES is an imaginary delusion. Clinical and medical research has shown that ES is associated with a number of comorbid conditions including affective psychosis, paranoid schizophrenia, organic brain disease, neurosis, and anankastic/paranoid personality disorder. It has also been reported in some people undergoing alcohol withdrawal, cocaine misuse, cerebrovascular disease, senile dementia, and thalamic brain lesions.
There can also be medical complications for ES sufferers. The fictional example of someone pulling their teeth out is not unknown although the gouging or digging out of the perceived parasites is more common. However, a paper by Dr. M. Nel and colleagues in the Journal of the South African Veterinary Association, most ES sufferers are able to function normally in all other aspects of their lives, in spite of their fixed parasitic delusions. They also noted that:
“The typical history often describes numerous attempts at eradicating the infestation. These could include taking medication, applying topical treatments, using pesticides, making use of exterminators, discarding clothing and possessions and even relocating…In a study of 94 patients (Ohtaki, 1991), most patients complained of itching and/or a tickling sensation. In order to rid themselves of the so-called parasites, patients often scratch, pick and wash frequently or use caustic agents on their skin, almost invariably leading to traumatic skin lesions”.
According to one meta-analytic study of 1,223 ES cases (published by Dr. W. Trabart in the journal Psychopathology), the occurrence of ES as a shared psychotic disorder is an uncommon phenomenon. He reported only about 5-15% of such cases were found. It was also reported that ES was more common amongst females (two-thirds female, one-third male), and is more prevalent in those over the age of 40 years. The symptoms had lasted three to four-and-a-half years. ES can be classified into three sub-types (primary; secondary-functional; and secondary-organic) based on the presenting symptoms:
- Primary ES refers to individuals that have the delusional parasitic infestation but no other comorbid conditions (i.e., other mental functioning is normal). Those where ES occurs by suggestion from another individual (e.g., the folie a deux case mentioned above) would be included in this ES sub-type. (It’s also worth noting that at least three studies have reported either the folie à deux or folie à trois among family members or loved ones including papers in the British Journal of Psychiatry and Dermatologica). Treatment is usually pharmacotherapy-based and utilizes drugs that are used in the treatment of other delusional-based syndromes (e.g., atypical antipsychotic drugs such as risperidone and olanzapine.
- Secondary-functional ES refers to individuals that have the delusional parasitic infestation and are associated with another psychiatric condition (e.g., clinical depression, schizophrenia).
- Secondary-organic ES refers to individuals that have the delusional parasitic infestation that is caused by another medical illness (e.g., cancer, diabetes, tubercolosis, hyperthyroidism, vitamin deficiency, cerebrovascular disease, neurological disorders). Other conditions can also facilitate ES including drug abuse (including stimulant psychosis), various allergies, and the menopause). Treating the primary disorder will often lead to a reduction or elimination of the ES symptoms.
The most recent review of the literature I came across was by Dr. Andrea Boggild and colleagues, and published in a 2010 issue of the International Journal of Infectious Diseases, they concluded that:
“In summary, [delusional parasitosis] is one of the more challenging entities that infectious diseases specialists will be enlisted to help treat. Unfortunately, optimal therapeutic regimens leading to sustained remission are lacking, and assurances on the part of the clinician do little to ameliorate patient suffering”.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Further reading
Berrios GE (1985). Delusional parasitosis and physical disease. Comprehensive Psychiatry 26, 395-403.
Boggild, A.K., Nicks, B.A., Yen, L., Voorhis, W.V., McMullen, R., Buckner, F.S., & Liles, W.C. (2010). Delusional parasitosis: six-year experience with 23 consecutive cases at an academic medical center. International Journal of Infectious Diseases, 14, e317–e321.
Bourgeois, M.L., Duhamel, P. & Verdoux, H. (1992). Delusional parasitosis: Folie à deux and attempted murder of a family doctor. British Journal of Psychiatry, 161, 709-711.
Frances, A. & Munro, A. (1989). Treating a woman who believes she has bugs under her skin. Hospital and Community Psychiatry, 40, 1113–1114.
Freinhar, Jack P (1984). Delusions of parasitosis. Psychosomatics, 25, 47-53.
Gieler, U. & Knoll, M. (1990). Delusional parasitosis as ‘folie à trois’. Dermatologica, 181, 122-125.
Goddard J (1995). Analysis of 11 cases of delusions of parasitosis reported to the Mississippi Department of Health. Southern Medical Journal 88, 837-839.
Gould, W.M. & Gragg, T.M. (1976). Delusions of parasitosis. Archives of Dermatology 112, 1745–1748.
Grace, K.J. (1987). Delusory cleptoparasitosis: Delusions of arthropod infestation in the home. Pan-Pacific Entomologist, 63, 1-4.
Koblenzer, C.S. (1993). The clinical presentation, diagnosis and treatment of delusions of parasitosi: A dermatologic perspective. Bulletin of the Society of Vector Ecologists 18, 6-10.
Koo, J. & Gambla, C (1996). Delusions of parasitosis and other forms of monosymptomatic hypochondriacal psychosis. General discussion and case illustrations. Dermatologic Clinic, 14, 429-438.
Morris, M. (1991). Delusional manifestation. British Journal of Psychiatry, 159, 83-87.
Hinkle, N.C. (2000). Delusory parasitosis. American Entomologist 46, 17-25.
Ohtaki, N. (1991). Ninety four cases with delusions of parasitosis. Japanese Journal of Dermatology, 101, 439-446.
Rasmussen, J.E. & Voorhees, J.J. (1990). Psychosomatic dermatology. Archives of Dermatology, 126, 90-93.
Nel, M., Schoeman, J.P. & Lobetti, R.G. (2001). Delusions of parasitosis in clients presenting pets for veterinary care. Journal of the South African Veterinary Association, 72, 167-169.
Trabert, W. (1995). 100 years of delusional parasitosis. Meta-analysis of 1,223 case reports. Psychopathology, 28, 238-46
Webb, J.P. (1993). Case histories of individuals with delusions of parasitosis in southern California and a proposed protocol for initiating effective medical assistance. Bulletin of the Society of Vector Ecologists 18, 16-24.