Understanding the Brain

Alexithymia

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Alexithymia (play /ˌlɛksəˈθmiə/) from the Ancient Greek words λέξις (lexis, "diction", "word") and θυμός (thumos, "soul, as the seat of emotion, feeling, and thought") modified by an alpha-privative—literally "without words for emotions"—is a term coined by psychotherapist Peter Sifneos in 1973[1][2] to describe a state of deficiency in understanding, processing, or describing emotions.

Classification

Alexithymia is considered to be a personality trait that places individuals at risk for other medical and psychiatric disorders while reducing the likelihood that these individuals will respond to conventional treatments for the other conditions.[3] Alexithymia is not classified as a mental disorder in the DSM-IV. It is a dimensional personality trait that varies in severity from person to person. A person's alexithymia score can be measured with questionnaires such as the Toronto Alexithymia Scale (TAS-20), the Bermond-Vorst Alexithymia Questionnaire (BVAQ),[4] the Online Alexithymia Questionnaire (OAQ-G2)[5] or the Observer Alexithymia Scale (OAS).[3]

Alexithymia is defined by:[6]

  1. difficulty identifying feelings and distinguishing between feelings and the bodily sensations of emotional arousal
  2. difficulty describing feelings to other people
  3. constricted imaginal processes, as evidenced by a scarcity of fantasies
  4. a stimulus-bound, externally oriented cognitive style.

In studies of the general population the degree of alexithymia was found to be influenced by age, but not by gender; the rates of alexithymia in healthy controls have been found at: 8.3% (2 of 24 persons); 4.7% (2 of 43); 8.9% (16 of 179); and 7% (4 of 56). Thus, several studies have reported that the prevalence rate of alexithymia is less than 10%.[7] A less common finding suggests that there may be a higher prevalence of alexithymia amongst males than females, which may be accounted for by difficulties some males have with "describing feelings", but not by difficulties in "identifying feelings" in which males and females show similar abilities.[8]

The alexithymia construct is strongly inversely related to the concepts of psychological mindedness[9] and emotional intelligence[10][11] and M. Bagby and G. Taylor state that there is "strong empirical support for alexithymia being a stable personality trait rather than just a consequence of psychological distress".[12] Other opinions differ and can show evidence that it may be state-dependent.[13]

Bagby and Taylor also suggest that there may be two kinds of alexithymia, "primary alexithymia" which is an enduring psychological trait that does not alter over time, and "secondary alexithymia" which is state-dependent and disappears after the evoking stressful situation has changed. These two manifestations of alexithymia are otherwise called "trait" or "state" alexithymia.[12]

Description

Typical deficiencies may include problems identifying, describing, and working with one's own feelings, often marked by a lack of understanding of the feelings of others; difficulty distinguishing between feelings and the bodily sensations of emotional arousal;[1] confusion of physical sensations often associated with emotions; few dreams or fantasies due to restricted imagination; and concrete, realistic, logical thinking, often to the exclusion of emotional responses to problems. Those who have alexithymia also report very logical and realistic dreams, such as going to the store or eating a meal.[14] Clinical experience suggests it is the structural features of dreams more than the ability to recall them that best characterizes alexithymia.[1]

Some alexithymic individuals may appear to contradict the above mentioned characteristics because they can experience chronic dysphoria or manifest outbursts of crying or rage.[15][16][17] However, questioning usually reveals that they are quite incapable of describing their feelings or appear confused by questions inquiring about specifics of feelings.[6]

According to Henry Krystal, individuals suffering from alexithymia think in an operative way and may appear to be superadjusted to reality. In psychotherapy, however, a cognitive disturbance becomes apparent as patients tend to recount trivial, chronologically ordered actions, reactions, and events of daily life with monotonous detail.[18][19] In general, these individuals lack imagination, intuition, empathy, and drive-fulfillment fantasy, especially in relation to objects. Instead, they seem oriented toward things and even treat themselves as robots. These problems seriously limit their responsiveness to psychoanalytic psychotherapy; psychosomatic illness or substance abuse is frequently exacerbated should these individuals enter psychotherapy.[6]

A common misconception about alexithymia is that affected individuals are totally unable to express emotions verbally and that they may even fail to acknowledge that they experience emotions. Even before coining the term, Sifneos (1967) noted patients often mentioned things like anxiety or depression. The distinguishing factor was their inability to elaborate beyond a few limited adjectives such as "happy" or "unhappy" when describing these feelings.[20] The core issue is that alexithymics have poorly differentiated emotions limiting their ability to distinguish and describe them to others.[1] This contributes to the sense of emotional detachment from themselves and difficulty connecting with others, making alexithymia negatively associated with life satisfaction even when depression and other confounding factors are controlled for.[21]

Relational issues

According to Vanheule, Desmet and Meganck (2006) alexithymia creates interpersonal problems because these individuals avoid emotionally close relationships, or if they do form relationships with others they tend to position themselves as either dependent, dominant, or impersonal, "such that the relationship remains superficial".[22] Inadequate "differentiation" between self and others by alexithymic individuals has been observed by Blaustein & Tuber (1998) and Taylor et al. (1997).[23]

In a study, a large group of alexithymic individuals completed the 64-item Inventory of Interpersonal Problems (IIP-64) which found that "two interpersonal problems are significantly and stably related to alexithymia: cold/distant and non-assertive social functioning. All other IIP-64 subscales were not significantly related to alexithymia."[22]

Chaotic interpersonal relations have also been observed by Sifneos.[24] Due to the inherent difficulties identifying and describing emotional states in self and others, alexithymia also negatively affects relationship satisfaction between couples.[25]

In a 2008 study[26] alexithymia was found to be correlated with impaired understanding and demonstration of relational affection, and that this impairment contributes to poorer mental health, poorer relational well-being, and lowered relationship quality.[26]

Some individuals working for organizations in which control of emotions is the norm might show alexithymic-like behavior but not be alexithymic. However, over time the lack of self-expression becomes part of their everyday lives and they end up losing their original self-identity.[27]

Medical and psychiatric illness

Alexithymia frequently co-occurs with other disorders, with a representative prevalence of 85% in autism spectrum disorders,[5][28] 40% in posttraumatic stress disorder,[29] 63% in anorexia nervosa, 56% in bulimia,[30] 45% in major depressive disorder,[13] 34% in panic disorder,[31] and 50% in substance abusers.[32] Alexithymia also occurs in individuals with acquired or traumatic brain injury.[33][34][35]

Research indicates that alexithymia overlaps with Asperger syndrome.[5] In a 2004 study, Uta Frith reported an overlap and that at least half of the Asperger syndrome group obtained scores on the Toronto Alexithymia Scale (TAS-20) that would classify them as severely impaired.[36] Fitzgerald & Bellgrove pointed out that, "Like Alexithymia, Asperger's syndrome is also characterised by core disturbances in speech and language and social relationships".[37] Hill & Berthoz agreed with Fitzgerald & Bellgrove (2006) and in response stated that "there is some form of overlap between alexithymia and ASDs". They also pointed to studies that revealed impaired Theory of Mind skill in alexithymia, neuroanatomical evidence pointing to a shared etiology and similar social skills deficits.[38] The exact nature of the overlap is uncertain. Alexithymic traits in AS may be linked to depression or anxiety;[36] the mediating factors are unknown and it is possible that alexithymia predisposes to anxiety.[39]

Alexithymia is correlated with certain personality disorders,[40] substance use disorders,[41][42] some anxiety disorders,[43] and sexual disorders,[44] as well as certain physical illnesses, such as hypertension,[45] inflammatory bowel disease,[46] and functional dyspepsia.[47] Alexithymia is further linked with disorders such as migraine headaches, lower back pain, irritable bowel syndrome, asthma, nausea, allergies, and fibromyalgia, which may be psychosomatic in origin.[48]

An inability to modulate emotions is a possibility in explaining why some alexithymics are prone to discharge tension arising from unpleasant emotional states through impulsive acts or compulsive behaviors such as binge eating,[49] substance abuse,[50] perverse sexual behavior, or the self-starvation of anorexia nervosa.[49] The failure to regulate emotions cognitively might result in prolonged elevations of the autonomic nervous system (ANS) and neuroendocrine systems which can lead to somatic diseases.[48] Alexithymics also show a limited ability to experience positive emotions leading Krystal (1988) and Sifneos (1987) to describe many of these individuals as anhedonic.[2]

Causes

It is unclear what causes alexithymia, though several theories have been proposed. There is evidence both for a genetic basis, meaning some people are predisposed to develop alexithymia, as well as for environmental causes.

Early studies showed evidence that there may be an interhemispheric transfer deficit among alexithymics; that is, the emotional information from the right hemisphere is not being properly transferred to the language regions in the left hemisphere, as can be caused by a decreased corpus callosum, often present in psychiatric patients who have suffered severe childhood abuse.[51] A neuropsychological study in 1997 indicated that alexithymia may be due to a disturbance to the right hemisphere of the brain, which is largely responsible for processing emotions.[52] In addition, another neuropsychological model suggests that alexithymia may be related to a dysfunction of the anterior cingulate cortex.[53] These studies have some shortcomings, however, and the empirical evidence about the causes of alexithymia remains inconclusive.[54] Joyce McDougall objected to the strong focus by clinicians on neurophysiological at the expense of psychological explanations for the genesis and operation of alexithymia, and introduced the alternative term "disaffectation" to stand for psychogenic alexithymia.[55] For McDougall, the disaffected individual had at some point "experienced overwhelming emotion that threatened to attack their sense of integrity and identity", to which they applied psychological defenses to pulverize and eject all emotional representations from consciousness.[56] A similar line of interpretation has been taken up using the methods of phenomenology.[57]

French psychoanalyst, Joyce McDougall, noted that all infants are born unable to identify, organize, and speak about their emotional experiences (the word infans is from the Latin "not speaking"), and are "by reason of their immaturity inevitably alexithymic".[58] Based on this fact McDougall proposed in 1985 that the alexithymic part of an adult personality could be "an extremely arrested and infantile psychic structure".[58] The first language of an infant is nonverbal facial expressions. The mother's emotional state is important for determining how any child might develop. Neglect or indifference to varying changes in a child's facial expressions without proper feedback can promote an invalidation of the facial expressions manifested by the child. The parent's ability to reflect self-awareness to the child is another important factor. If the adult is incapable of recognizing and distinguishing emotional expressions in the child, it can influence the child's capacity to understand emotional expressions.[1]

Although environmental, neurological, and genetic factors are each involved, the role of genetic and environmental factors for developing alexithymia is still unclear.[59] The results from a large population-based sample of Danish twins suggest that genetic factors have a noticeable and similar impact on all facets of alexithymia. While the results suggested a moderate influence of shared environmental factors, results are in concordance with the general finding that environmental influences on most psychological traits are primarily of the nonshared rather than the shared type.[59] One hypothesized environmental cause is head injury; persons suffering a traumatic brain injury are six times more likely to exhibit alexithymia.[60]

See also

Notes

  1. 1.0 1.1 1.2 1.3 1.4 Bar-On & Parker (2000), pp. 40–59
  2. 2.0 2.1 Taylor (1997), pp. 28–31
  3. 3.0 3.1 Haviland MG, Warren WL, Riggs ML (2000). "An observer scale to measure alexithymia". Psychosomatics 41 (5): 385–92. doi:10.1176/appi.psy.41.5.385. PMID 11015624. http://psy.psychiatryonline.org/cgi/content/full/41/5/385#R26732. Retrieved 2007-08-10. 
  4. Vorst HCM, Bermond B (February 2001). "Validity and reliability of the Bermond-Vorst Alexithymia Questionnaire". Personality and Individual Differences, Volume 30, Number 3, pp. 413–434(22) DOI: 10.1016/S0191-8869(00)00033-7
  5. 5.0 5.1 5.2 Paula-Perez, I; Alexitimia y sindrome de Asperger, Rev Neurol. 2010 Mar 3;50 Suppl 3:S85-90
  6. 6.0 6.1 6.2 Taylor (1997), p. 29
  7. Fukunishi I, Berger D, Wogan J, Kuboki T (1999). "Alexithymic traits as predictors of difficulties with adjustment in an outpatient cohort of expatriates in Tokyo". Psychological reports 85 (1): 67–77. doi:10.2466/PR0.85.5.67-77. PMID 10575975. http://www.japanpsychiatrist.com/Abstracts/Expats1.html. Retrieved 2007-08-10. 
  8. Salminen JK, Saarijärvi S, Aärelä E, Toikka T, Kauhanen J (1999). "Prevalence of alexithymia and its association with sociodemographic variables in the general population of Finland". Journal of psychosomatic research 46 (1): 75–82. doi:10.1016/S0022-3999(98)00053-1. PMID 10088984. 
  9. Taylor & Taylor (1997), pp. 77–104
  10. Taylor (1997), p. 38
  11. Parker, JDA; Taylor, GJ; Bagby, RM (2001). "The Relationship Between Emotional Intelligence and Alexithymia". Personality and Individual Differences 30: 107–115. doi:10.1016/S0191-8869(00)00014-3. 
  12. 12.0 12.1 Taylor (1997), p. 37
  13. 13.0 13.1 Honkalampi K, Hintikka J, Laukkanen E, Lehtonen J, Viinamäki H (2001). "Alexithymia and depression: a prospective study of patients with major depressive disorder". Psychosomatics 42 (3): 229–34. doi:10.1176/appi.psy.42.3.229. PMID 11351111. http://psy.psychiatryonline.org/cgi/content/full/42/3/229. 
  14. Krystal H (1979). "Alexithymia and psychotherapy". American journal of psychotherapy 33 (1): 17–31. PMID 464164. 
  15. Nemiah et al. (1970), pp. 432–33
  16. Krystal (1988), p. 246; McDougall (1985), pp. 169–70
  17. Taylor (1997), pp. 29, 246–47
  18. Krystal (1988) pp. 246-247
  19. Nemiah, CJ (1978). "Alexithymia and Psychosomatic Illness". Journal of Continuing Education 39: 25–37. 
  20. Sifneos, PE (1967). "Clinical Observations on some patients suffering from a variety of psychosomatic diseases". Acta Medicina Psychosomatica 7: 1–10. 
  21. Mattila, AK, Poutanen O, Koivisto AM, Salokangas RKR, Joukamaa M. "Alexithymia and Life Satisfaction in Primary Healthcare Patients". Psychosomatics 48:523-529, December 2007
  22. 22.0 22.1 Vanheule S, Desmet M, Meganck R, Bogaerts S (2007). "Alexithymia and interpersonal problems". Journal of clinical psychology 63 (1): 109–17. doi:10.1002/jclp.20324. PMID 17016830. 
  23. Blaustein JP, Tuber SB (1998). Knowing the Unspeakeable. Bulletin of the Menninger Clinic, 62, 351–365; and Taylor (1997) pp. 26-46
  24. Sifneos PE (1996). "Alexithymia: past and present". The American journal of psychiatry 153 (7 Suppl): 137–42. PMID 8659637. 
  25. Yelsma P, Marrow S (2003). "An Examination of Couples' Difficulties With Emotional Expressiveness and Their Marital Satisfaction". Journal of Family Communication 3 (1): 41–62. doi:10.1207/S15327698JFC0301_03. 
  26. 26.0 26.1 Colin Hesse & Kory Floyd: Affectionate experience mediates the effects of alexithymia on mental health and interpersonal relationships, Journal of Social and Personal Relationships, Vol. 25, No. 5, 793-810 (2008) DOI: 10.1177/0265407508096696
  27. Manfred F.R. Kets de Vries (2001) "Struggling with the Demon: Perspectives on Individual and Organizational Irrationality"
  28. Hill E, Berthoz S, Frith U (2004). "Brief report: cognitive processing of own emotions in individuals with autistic spectrum disorder and in their relatives". Journal of Autism and Developmental Disorders 34 (2): 229–235. doi:10.1023/B:JADD.0000022613.41399.14. PMID 15162941. 
  29. Shipko S, Alvarez WA, Noviello N (1983). "Towards a teleological model of alexithymia: alexithymia and post-traumatic stress disorder". Psychotherapy and psychosomatics 39 (2): 122–6. doi:10.1159/000287730. PMID 6878595. 
  30. Cochrane CE, Brewerton TD, Wilson DB, Hodges EL (1993). "Alexithymia in the eating disorders". The International journal of eating disorders 14 (2): 219–22. doi:10.1002/1098-108X(199309)14:2<219::AID-EAT2260140212>3.0.CO;2-G. PMID 8401555. 
  31. Cox BJ, Swinson RP, Shulman ID, Bourdeau D (1995). "Alexithymia in panic disorder and social phobia". Comprehensive psychiatry 36 (3): 195–8. doi:10.1016/0010-440X(95)90081-6. PMID 7648842. 
  32. Taylor GJ, Parker JD, Bagby RM (1990). "A preliminary investigation of alexithymia in men with psychoactive substance dependence". The American journal of psychiatry 147 (9): 1228–30. PMID 2386256. 
  33. Williams C, Wood RL (March 2010). "Alexithymia and emotional empathy following traumatic brain injury". J Clin Exp Neuropsychol 32 (3): 259–67. doi:10.1080/13803390902976940. PMID 19548166. 
  34. Koponen S, Taiminen T, Honkalampi K, et al. (2005). "Alexithymia after traumatic brain injury: its relation to magnetic resonance imaging findings and psychiatric disorders". Psychosom Med 67 (5): 807–12. doi:10.1097/01.psy.0000181278.92249.e5. PMID 16204442. 
  35. Becerra R, Amos A, Jongenelis S (July 2002). "Organic alexithymia: a study of acquired emotional blindness". Brain Inj 16 (7): 633–45. doi:10.1080/02699050110119817. PMID 12119081. 
  36. 36.0 36.1 Frith U (2004). "Emanuel Miller lecture: confusions and controversies about Asperger syndrome". Journal of child psychology and psychiatry, and allied disciplines 45 (4): 672–86. doi:10.1111/j.1469-7610.2004.00262.x. PMID 15056300.  The study to which Frith refers is Hill E, Berthoz S, Frith U (2004). "Brief report: cognitive processing of own emotions in individuals with autistic spectrum disorder and in their relatives". Journal of Autism and Developmental Disorders 34 (2): 229–235. doi:10.1023/B:JADD.0000022613.41399.14. PMID 15162941. 
  37. Fitzgerald M, Bellgrove MA (2006). "The overlap between alexithymia and Asperger's syndrome". Journal of autism and developmental disorders 36 (4): 573–6. doi:10.1007/s10803-006-0096-z. PMC 2092499. PMID 16755385. http://www.springerlink.com/content/238u61255x78m843/. Retrieved 2007-04-11. 
  38. Hill E, Berthoz S (May 2006). "Response to 'Letter to the Editor: The Overlap Between Alexithymia and Asperger's syndrome', Fitzgerald and Bellgrove, Journal of Autism and Developmental Disorders, 36(4)". Journal of Autism and Developmental Disorders 36 (8): 1143–1145. doi:10.1007/s10803-006-0287-7. PMID 17080269. 
  39. Tani P, Lindberg N, Joukamaa M, et al. (2004). "Asperger syndrome, alexithymia and perception of sleep". Neuropsychobiology 49 (2): 64–70. doi:10.1159/000076412. PMID 14981336. 
  40. Schizotypal, dependent and avoidant disorders are particularly indicated: See Taylor (1997), pp. 162–165
  41. Li CS, Sinha R (1 March 2006). "Alexithymia and stress-induced brain activation in cocaine-dependent men and women". Journal of psychiatry & neuroscience : JPN 31 (2): 115–21. PMC 1413961. PMID 16575427. 
  42. Lumley MA, Downey K, Stettner L, Wehmer F, Pomerleau OF (1994). "Alexithymia and negative affect: relationship to cigarette smoking, nicotine dependence, and smoking cessation". Psychotherapy and psychosomatics 61 (3–4): 156–62. doi:10.1159/000288884. PMID 8066152. 
  43. Jones BA (1984). "Panic attacks with panic masked by alexithymia" (PDF). Psychosomatics 25 (11): 858–9. PMID 6505131. http://psy.psychiatryonline.org/cgi/reprint/25/11/858. Retrieved 2006-12-17. 
  44. Michetti PM, Rossi R, Bonanno D, Tiesi A, Simonelli C (2006). "Male sexuality and regulation of emotions: a study on the association between alexithymia and erectile dysfunction (ED)". Int. J. Impot. Res. 18 (2): 170–4. doi:10.1038/sj.ijir.3901386. PMID 16151475. http://www.nature.com/ijir/journal/v18/n2/full/3901386a.html. Retrieved 2007-02-02. 
  45. Jula A, Salminen JK, Saarijärvi S (1 April 1999). "Alexithymia: a facet of essential hypertension". Hypertension 33 (4): 1057–61. PMID 10205248. http://hyper.ahajournals.org/cgi/content/full/33/4/1057. Retrieved 2006-12-17. 
  46. Verissimo R, Mota-Cardoso R, Taylor G (1998). "Relationships between alexithymia, emotional control, and quality of life in patients with inflammatory bowel disease". Psychotherapy and psychosomatics 67 (2): 75–80. doi:10.1159/000012263. PMID 9556198. 
  47. Jones MP, Schettler A, Olden K, Crowell MD (2004). "Alexithymia and somatosensory amplification in functional dyspepsia". Psychosomatics 45 (6): 508–16. doi:10.1176/appi.psy.45.6.508. PMID 15546828. http://psy.psychiatryonline.org/cgi/content/full/45/6/508. Retrieved 2006-12-17. 
  48. 48.0 48.1 Taylor (1997), pp. 216–248
  49. 49.0 49.1 Taylor (1997), pp. 190–216
  50. Taylor (1997), pp. 166–190
  51. Hoppe KD, Bogen JE (1977). "Alexithymia in twelve commissurotomized patients". Psychotherapy and psychosomatics 28 (1–4): 148–55. doi:10.1159/000287057. PMID 609675. 
  52. Jessimer M, Markham R (1997). "Alexithymia: a right hemisphere dysfunction specific to recognition of certain facial expressions?". Brain and cognition 34 (2): 246–58. doi:10.1006/brcg.1997.0900. PMID 9220088. 
  53. Lane RD, Ahern GL, Schwartz GE, Kaszniak AW (1997). "Is alexithymia the emotional equivalent of blindsight?". Biol. Psychiatry 42 (9): 834–44. doi:10.1016/S0006-3223(97)00050-4. PMID 9347133. 
  54. Tabibnia G, Zaidel E (2005). "Alexithymia, interhemispheric transfer, and right hemispheric specialization: a critical review". Psychotherapy and psychosomatics 74 (2): 81–92. doi:10.1159/000083166. PMID 15741757. 
  55. McDougall (1989), pp. 93, 103
  56. McDougall (1989), pp. 93–94
  57. Maclaren K (2006). "Emotional Disorder and the Mind-Body Problem: A Case Study of Alexithymia". Chiasmi International 8: 139–55. 
  58. 58.0 58.1 McDougall (1985), p. 161
  59. 59.0 59.1 Michael Martini, Jørgensena, Robert Zachariaea, Axel Skyttheb, Kirsten KyvikbGenetic, 'Environmental Factors in Alexithymia: A Population-Based Study of 8,785 Danish Twin Pairs'. Psychotherapy and Psychosomatics 2007;76:369-375 (DOI: 10.1159/000107565)
  60. Williams C, Wood RL (June 2009). "Alexithymia and emotional empathy following traumatic brain injury". J Clin Exp Neuropsychol 32 (3): 1–11. doi:10.1080/13803390902976940. PMID 19548166. Lay summary – Psychology Today (January 3, 2010). 

References

  • Bar-On, Reuven; Parker, James DA (2000). The Handbook of Emotional Intelligence: Theory, Development, Assessment, and Application at Home, School, and in the Workplace. San Francisco, California: Jossey-Bass. ISBN 0-7879-4984-1. 
  • Krystal, H (1988). Integration and Self Healing: Affect, Trauma, Alexithymia. Hillsdale, NJ: The Analytic Press. ISBN 0-88163-070-5. 
  • Linden W, Wen F, Paulhaus DL (1994). Measuring alexithymia: reliability, validity, and prevalence. In: J. Butcher, C. Spielberger (Eds.). Advances in Personality Assessment. Hillsdale, NJ: Lawrence Erlbaum Associates.
  • McDougall, J (1989). Theaters of the Body: A Psychoanalytic Approach to Psychosomatic Illness, Norton.
  • McDougall, J (1985). Theatres of the Mind: Truth and Illusion on the Psychoanalytic Stage. New York: Basic Books. ISBN 0-946960-70-4. 
  • Nemiah JC, Freyberger H, Sifneos PE, "Alexithymia: A View of the Psychosomatic Process" in O.W. Hill (1970) (ed), Modern Trends in Psychosomatic Medicine, Vol 2.
  • Taylor, Graeme J; Bagby, R. Michael and Parker, James DA (1997). Disorders of Affect Regulation: Alexithymia in Medical and Psychiatric Illness. Cambridge: Cambridge University Press. ISBN 0-521-45610-X. 
  • Taylor GJ & Taylor HS (1997). Alexithymia. In M. McCallum & W.E. Piper (Eds.) Psychological mindedness: A contemporary understanding. Munich: Lawrence Erlbaum Associates

External links