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Cognitive Disorders

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A cognitive disorder is defined as a significant decline in one’s ability to process and recall information. The DSM IV (American Psychiatric Association 1994) describes three major types of cognitive disorder: delirium, dementia and amnestic disorder. A delirium develops over a short period of time and is characterized by an impairment of short-term memory, disorientation and perceptual and language problems. Amnestic disorders are characterized by impairment of memory such that sufferers are unable to learn and recall new information. However, no other declines in cognitive functioning are associated with this type of disorder. Both delirium and amnestic disorders are usually due to the physiological effects of a general medical condition (e.g., head injuries, high fevers) or of substance use. There is little reason to suspect that occupational factors play a direct role in the development of these disorders.

However, research has suggested that occupational factors may influence the likelihood of developing the multiple cognitive deficits involved in dementia. Dementia is characterized by memory impairment and at least one of the following problems: (a) reduced language function; (b) a decline in one’s ability to think abstractly; or (c) an inability to recognize familiar objects even though one’s senses (e.g., vision, hearing, touch) are not impaired. Alzheimer’s disease is the most common type of dementia.

The prevalence of dementia increases with age. Approximately 3% of people over the age of 65 years will suffer from a severe cognitive impairment during any given year. Recent studies of elderly populations have found a link between a person’s occupational history and his or her likelihood of suffering from dementia. For example, a study of the rural elderly in France (Dartigues et al. 1991) found that people whose primary occupation had been farm worker, farm manager, provider of domestic service or blue-collar worker had a significantly elevated risk of having a severe cognitive impairment when compared to those whose primary occupation had been teacher, manager, executive or professional. Furthermore, this elevated risk was not due to differences between the groups of workers in terms of age, sex, education, drinking of alcoholic beverages, sensory impairments or the taking of psychotropic drugs.

Because dementia is so rare among people younger than 65 years, no study has examined occupation as a risk factor among this population. However, a large study in the United States (Farmer et al. 1995) has shown that people under the age of 65 who have high levels of education are less likely to experience declines in cognitive functioning than are similarly aged people with less education. The authors of this study commented that education level may be a “marker variable” that is actually reflecting the effects of occupational exposures. At this point, such a conclusion is highly speculative.

Although several studies have found an association between one’s principal occupation and dementia among the elderly, the explanation or mechanism underlying the association is not known. One possible explanation is that some occupations involve higher exposure to toxic materials and solvents than do other occupations. For example, there is growing evidence that toxic exposures to pesticides and herbicides can have adverse neurological effects. Indeed, it has been suggested that such exposures may explain the elevated risk of dementia found among farm workers and farm managers in the French study described above. In addition, some evidence suggests that the ingestion of certain minerals (e.g., aluminium and calcium as components of drinking water) may affect the risk of cognitive impairment. Occupations may involve differential exposure to these minerals. Further research is needed to explore possible pathophysiological mechanisms.

Psychosocial stress levels of employees in various occupations may also contribute to the link between occupation and dementia. Cognitive disorders are not among the mental health problems that are commonly thought to be stress related. A review of the role of stress in psychiatric disorders focused on anxiety disorders, schizophrenia and depression, but made no mention of cognitive disorders (Rabkin 1993). One type of disorder, called dissociative amnesia, is characterized by an inability to recall a previous traumatic or stressful event but carries with it no other type of memory impairment. This disorder is obviously stress-related, but is not categorized as a cognitive disorder according to the DSM IV.

Although psychosocial stress has not been explicitly linked to the onset of cognitive disorders, it has been demonstrated that the experience of psychosocial stress affects how people process information and their ability to recall information. The arousal of the autonomic nervous system that often accompanies exposure to stressors alerts a person to the fact that “all is not as expected or as it should be” (Mandler 1993). At first, this arousal may enhance a person’s ability to focus attention on the central issues and to solve problems. However, on the negative side, the arousal uses up some of the “available conscious capacity” or the resources that are available for processing incoming information. Thus, high levels of psychosocial stress ultimately (1) limit one’s ability to scan all of the relevant available information in an orderly fashion, (2) interfere with one’s ability to rapidly detect peripheral cues, (3) decrease one’s ability to sustain focused attention and (4) impair some aspects of memory performance. To date, even though these decrements in information-processing skills can result in some of the symptomatology associated with cognitive disorders, no relationship has been demonstrated between these minor impairments and the likelihood of exhibiting a clinically diagnosed cognitive disorder.

A third possible contributor to the relationship between occupation and cognitive impairment may be the level of mental stimulation demanded by the job. In the study of rural elderly residents in France described above, the occupations associated with the lowest risk of dementia were those that involved substantial intellectual activity (e.g., physician, teacher, lawyer). One hypothesis is that the intellectual activity or mental stimulation inherent in these jobs produces certain biological changes in the brain. These changes, in turn, protect the worker from decline in cognitive function. The well-documented protective effect of education on cognitive functioning is consistent with such a hypothesis.

It is premature to draw any implications for prevention or treatment from the research findings summarized here. Indeed, the association between one’s lifetime principal occupation and the onset of dementia among the elderly may not be due to occupational exposures or the nature of the job. Rather, the relationship between occupation and dementia may be due to differences in the characteristics of workers in various occupations. For example, differences in personal health behaviours or in access to quality medical care may account for at least part of the effect of occupation. None of the published descriptive studies can rule out this possibility. Further research is needed to explore whether specific psychosocial, chemical and physical occupational exposures are contributing to the aetiology of this cognitive disorder.

 

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Contents

Preface
Part I. The Body
Blood
Cancer
Cardiovascular System
Digestive System
Mental Health
Mood and Affect
Resources
Musculoskeletal System
Nervous System
Renal-Urinary System
Reproductive System
Respiratory System
Sensory Systems
Skin Diseases
Systematic Conditions
Part II. Health Care
Part III. Management & Policy
Part IV. Tools and Approaches
Part V. Psychosocial and Organizational Factors
Part VI. General Hazards
Part VII. The Environment
Part VIII. Accidents and Safety Management
Part IX. Chemicals
Part X. Industries Based on Biological Resources
Part XI. Industries Based on Natural Resources
Part XII. Chemical Industries
Part XIII. Manufacturing Industries
Part XIV. Textile and Apparel Industries
Part XV. Transport Industries
Part XVI. Construction
Part XVII. Services and Trade
Part XVIII. Guides

Mental Health Additional Resources

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Mental Health References

American Psychiatric Association (APA). 1980. Diagnostic and Statistical Manual of Mental Disorders (DSM III). 3rd edition. Washington, DC: APA Press.

—. 1994. Diagnostic and Statistical Manual of Mental Disorders (DSM IV). 4th edition. Washington, DC: APA Press.

Ballenger, J. 1993. The co-morbidity and etiology of anxiety and depression. Update on Depression. Smith-Kline Beecham Workshop. Marina del Rey, Calif., 4 April.

Barchas, JD, JM Stolk, RD Ciaranello, and DA Hamberg. 1971. Neuroregulatory agents and psychological assessment. In Advances in Psychological Assessment, edited by P McReynolds. Palo Alto, Calif.: Science and Behavior Books.

Beaton, R, S Murphy, K Pike, and M Jarrett. 1995. Stress-symptom factors in firefighters and paramedics. In Organizational Risk Factors for Job Stress, edited by S Sauter and L Murphy. Washington, DC: APA Press.

Beiser, M, G Bean, D Erickson, K Zhan, WG Iscono, and NA Rector. 1994. Biological and psychosocial predictors of job performance following a first episode of psychosis. Am J Psychiatr 151(6):857-863.

Bentall, RP. 1990. The illusion or reality: A review and integration of psychological research on hallucinations. Psychol Bull 107(1):82-95.

Braverman, M. 1992a. Post-trauma crisis intervention in the workplace. In Stress and Well-Being at Work: Assessments and Interventions for Occupational Mental Health, edited by JC Quick, LR Murphy, and JJ Hurrell. Washington, DC: APA Press.

—. 1992b. A model of intervention for reducing stress related to trauma in the workplace. Cond Work Dig 11(2).

—. 1993a. Preventing stress-related losses: Managing the psychological consequences of worker injury. Compens Benefits Manage 9(2) (Spring).

—. 1993b. Coping with trauma in the workplace. Compens Benefits Manage 9(2) (Spring).

Brodsky, CM. 1984. Long-term workstress. Psychomatics 25 (5):361-368.

Buono, A and J Bowditch. 1989. The Human Side of Mergers and Acquisitions. San Francisco: Jossey-Bass.

Charney, EA and MW Weissman. 1988. Epidemiology of depressive and manic syndromes. In Depression and Mania, edited by A Georgotas and R Cancro. New York: Elsevier.

Comer, NL, L Madow, and JJ Dixon. 1967. Observation of sensory deprivation in a life-threatening situation. Am J Psychiatr 124:164-169.

Cooper, C and R Payne. 1992. International perspectives on research into work, well-being and stress management. In Stress and Well-Being at Work, edited by J Quick, L Murphy, and J Hurrell. Washington, DC: APA Press.

Dartigues, JF, M Gagnon, L Letenneur, P Barberger-Gateau, D Commenges, M Evaldre, and R Salamon. 1991. Principal lifetime occupation and cognitive impairment in a French elderly cohort (Paquid). Am J Epidemiol 135:981-988.

Deutschmann, C. 1991. The worker-bee syndrome in Japan: An analysis of working-time practices. In Working Time in Transition: The Political Economy of Working Hours in Industrial Nations, edited by K Hinrichs, W Roche, and C Sirianni. Philadephia: Temple Univ. Press.

DeWolf, CJ. 1986. Methodological problems in stress studies. In The Psychology of Work and Organizations, edited by G Debus and HW Schroiff. North Holland: Elsevier Science.

Drinkwater,  J. 1992. Death from overwork. Lancet 340: 598.

Eaton, WW, JC Anthony, W Mandel, and R Garrison. 1990. Occupations and the prevalence of major depressive disorder. J Occup Med 32(111):1079-1087.

Entin, AD. 1994. The work place as family, the family as work place. Unpublished paper presented at the American Psychological Association, Los Angeles, California.

Eysenck, HJ. 1982. The definition and measurement of psychoticism. Personality Indiv Diff 13(7):757-785.

Farmer, ME, SJ Kittner, DS Rae, JJ Bartko, and DA Regier. 1995. Education and change in cognitive function. The epidemiological catchment area study. Ann Epidemiol 5:1-7.

Freudenberger, HJ. 1975. The staff burn-out syndrome in alternative institutions. Psycother Theory, Res Pract 12:1.

—. 1984a. Burnout and job dissatisfaction: Impact on the family. In Perspectives on Work and Family, edited by JC Hammer and SH Cramer. Rockville, Md: Aspen.

—. 1984b. Substance abuse in the work place. Cont Drug Prob 11(2):245.

Freudenberger, HJ and G North. 1986. Women’s Burnout: How to Spot It, How to Reverse It and How to Prevent It. New York: Penguin Books.

Freudenberger, HJ and G Richelson. 1981. Burnout: How to Beat the High Cost of Success. New York: Bantam Books.

Friedman, M and RH Rosenman. 1959. Association of specific overt behavior pattern with blood and cardiovascular findings. J Am Med Assoc 169:1286-1296.

Greenberg, PE, LE Stiglin, SN Finkelstein, and ER Berndt. 1993a. The economic burden of depression in 1990. J Clin Psychiatry 54(11):405-418.

—. 1993b. Depression: A neglected major illness. J Clin Psychiatry 54(11):419-424.

Gründemann, RWM, ID Nijboer, and AJM Schellart. 1991. The Work-Relatedness of Drop-Out from Work for Medical Reasons. Den Haag: Ministry of Social Affairs and Employment.

Hayano, J, S Takeuchi, S Yoshida, S Jozuka, N Mishima, and T Fujinami. 1989. Type A behavior pattern in Japanese employees: Cross-cultural comparison of major factors in Jenkins Activity Survey (JAS) responses. J Behav Med 12(3):219-231.

Himmerstein, JS and GS Pransky. 1988. Occupational Medicine: Worker Fitness and Risk Evaluations. Vol. 3. Philadelphia: Hanley & Belfus.

Hines, LL, TW Durham, and GR Geoghegan. 1991. Work and self-concept: The development of a scale. J Soc Behav Personal 6:815-832.

Hobfoll, WE. 1988. The Ecology of Stress. New York: Hemisphere.

Holland, JL. 1973. Making Vocational Choices: A Theory of Careers. Englewood Cliffs, NJ: Prentice Hall.

Houtman, ILD and MAJ Kompier. 1995. Risk factors and occupational risk groups for work stress in the Netherlands. In Organizational Risk Factors for Job Stress, edited by SL Sauter and LR Murphy. Washington, DC: APA Press.

Houtman, I, A Goudswaard, S Dhondt, M van der Grinten, V Hildebrandt, and M Kompier. 1995.
Evaluation of the Monitor on Stress and Physical Load. The Hague: VUGA.

Human Capital Initiative (HCI). 1992. Changing nature of work. APS Observer Special Issue.

International Labour Organization (ILO). 1995. World Labour Report. No. 8. Geneva: ILO.

Jeffreys, J. 1995. Coping With Workplace Change: Dealing With Loss and Grief. Menlo Park, Calif.: Crisp.

Jorgensen, P. 1987. Social course and outcome of delusional psychosis. Acta Psychiatr Scand 75:629-634.

Kahn, JP. 1993. Mental Health in the Workplace -A Practical Psychiatric Guide. New York: Van Nostrand Reinhold.

Kaplan, HI and BJ Sadock. 1994. Synopsis of Psychiatry—Behavioral Sciences Clinical Psychiatry. Baltimore: Williams & Wilkins.

Kaplan, HI and BJ Sadock. 1995. Comprehensive Textbook of Psychiatry. Baltimore: Williams & Wilkins.

Karasek, R. 1979. Job demands, job decision latitude, and mental strain: Implications for job redesign. Adm Sci Q 24:285-307.

Karasek, R and T Theorell. 1990. Healthy Work. London: Basic Works.
Katon, W, A Kleinman, and G Rosen. 1982. Depression and somatization: A review. Am J Med 72:241-247.

Kobasa, S, S Maddi, and S Kahn. 1982. Hardiness and health: A prospective study. J Personal Soc Psychol 45:839-850.

Kompier, M, E de Gier, P Smulders, and D Draaisma. 1994. Regulations, policies and practices concerning work stress in five European countries. Work Stress 8(4):296-318.

Krumboltz, JD. 1971. Job Experience Kits. Chicago: Science Research Associates.

Kuhnert, K and R Vance. 1992. Job insecurity and moderators of the relation between job insecurity and employee adjustment. In Stress and Well-Being at Work, edited by J Quick, L Murphy, and J Hurrell Jr. Washington, DC: APA Press.

Labig, CE. 1995. Preventing Violence in the Workplace. New York: AMACON.

Lazarus, RS. 1991. Psychological stress in the workplace. J Soc Behav Personal 6(7):114.

Lemen, R. 1995. Welcome and opening remarks. Presented at Work, Stress and Health ’95: Creating Healthier Workplaces Conference, 15 September 1995, Washington, DC.

Levi, L, M Frandenhaeuser, and B Gardell. 1986. The characteristics of the workplace and the nature of its social demands. In Occupational Stress: Health and Performance at Work, edited by SG Wolf and AJ Finestone. Littleton, Mass: PSG.

Link, BP, PB Dohrenwend, and AE Skodol. 1986. Socio-economic status and schizophrenia: Noisome occupational characteristics as a risk factor. Am Soc Rev 51 (April):242-258.

Link, BG and A Stueve. 1994. Psychotic symptoms and the violent/illegal behaviour of mental patients compared to community controls. In Violence and Mental Disorders: Development in Risk Assessment, edited by J Mohnhan and HJ Steadman. Chicago, Illinois: Univ. of Chicago.

Lowman, RL. 1993. Counseling and Psychotherapy of Work Dysfunctions. Washington, DC: APA Press.

MacLean, AA. 1986. High Tech Survival Kit: Managing Your Stress. New York: John Wiley & Sons.

Mandler, G. 1993. Thought, memory and learning: Effects of emotional stress. In Handbook of Stress: Theoretical and Clinical Aspects, edited by L Goldberger and S Breznitz. New York: Free Press.

Margolis, BK and WH Kroes. 1974. Occupational stress and strain. In Occupational Stress, edited by A McLean. Springfield, Ill: Charles C. Thomas.

Massel, HK, RP Liberman, J Mintz, HE Jacobs, RV Rush, CA Giannini, and R Zarate. 1990. Evaluating the capacity to work of the mentally ill. Psychiatry 53:31-43.

McGrath, JE. 1976. Stress and behavior in organizations. In Handbook of Industrial and Organizational Psychology, edited by MD Dunnette. Chicago: Rand McNally College.

McIntosh, N. 1995. Exhilarating work: An antidote for dangerous work. In Organizational Risk Factors for Job Stress, edited by S Sauter and L Murphy. Washington, DC: APA Press.

Mishima, N, S Nagata, T Haratani, N Nawakami, S Araki, J Hurrell, S Sauter, and N Swanson. 1995. Mental health and occupational stress of Japanese local government employees. Presented at Work, Stress, and Health ‘95: Creating Healthier Workplaces, 15 September 1995, Washington, DC.

Mitchell, J and G Bray. 1990. Emergency Service Stress. Englewood Cliffs, NJ: Prentice Hall.

Monou, H. 1992. Coronary-prone behavior pattern in Japan. In Behavioral Medicine: An Integrated Biobehavioral Approach to Health and Illness, edited by S Araki. Amsterdam: Elsevier Science.

Muntaner, C, A Tien, WW Eaton, and R Garrison. 1991. Occupational characteristics and the occurrence of psychotic disorders. Social Psych Psychiatric Epidemiol 26:273-280.

Muntaner, C, AE Pulver, J McGrath, and WW Eaton. 1993. Work environment and schizophrenia: An extension of the arousal hypothesis to occupational self-selection. Social Psych Psychiatric Epidemiol 28:231-238.

National Defense Council for Victims of Karoshi. 1990. Karoshi. Tokyo: Mado Sha.
Neff, WS. 1968. Work and Human Behavior. New York: Altherton.

Northwestern National Life. 1991. Employee Burnout: America’s Newest Epidemic. Survey Findings. Minneapolis, Minn: Northwestern National Life.

O’Leary, L. 1993. Mental health at work. Occup Health Rev 45:23-26.

Quick, JC, LR Murphy, JJ Hurrell, and D Orman. 1992. The value of work, the risk of distress and the power of prevention. In Stress and Well-Being: Assessment and Interventions for Occupational Mental Health, edited by JC Quick, LR Murphy, and JJ Hurrell. Washington, DC: APA Press.

Rabkin, JG. 1993. Stress and psychiatric disorders. In Handbook of Stress: Theoretical and Clinical Aspects, edited by L Goldberger and S Breznitz. New York: Free Press.

Robins, LN, JE Heltzer, J Croughan, JBW Williams, and RE Spitzer. 1981. NIMH Diagnostic Interviews Schedule: Version III. Final report on contract no.  278-79-00 17DB and Research Office grant no. 33583. Rockville, Md: Department of Health and Human Services.

Rosch, P and K Pelletier. 1987. Designing workplace stress management programs. In Stress Management in Work Settings, edited by L Murphy and T Schoenborn. Rockville, Md: US Department of Health and Human Services.

Ross, DS. 1989. Mental health at work. Occup Health Safety 19(3):12.

Sauter, SL, LR Murphy, and JJ Hurrell. 1992. Prevention of work-related psychological disorders: A national strategy proposed by the National Institute for Occupational Safety and Health (NIOSH). In Work and Well-Being: An Agenda for 1990’s, edited by SL Sauter and G Puryear Keita. Washington, DC: APA Press.

Shellenberger, S, SS Hoffman, and R Gerson. 1994. Psychologists and the changing family-work system. Unpublished paper presented at the American Psychological Association, Los Angeles, California.

Shima, S, H Hiro, M Arai, T Tsunoda, T Shimomitsu, O Fujita, L Kurabayashi, A Fujinawa, and M Kato. 1995. Stress coping style and mental health in the workplace. Presented at Work, Stress and Health ‘95: Creating Healthier Workplaces, 15 September, 1995, Washington, DC.

Smith, M, D Carayon, K Sanders, S Lim, and D LeGrande. 1992. Employee stress and health complaints in jobs with and without electronic performance monitoring. Appl Ergon 23:17-27.

Srivastava, AK. 1989. Moderating effect of n-self actualization on the relationship of role stress with job anxiety. Psychol Stud 34:106-109.

Sternbach, D. 1995. Musicians: A neglected working population in crisis. In Organizational Risk Factors for Job Stress, edited by S Sauter and L Murphy. Washington, DC: APA Press.

Stiles, D. 1994. Video display terminal operators. Technology’s biopsychosocial stressors. J Am Assoc Occup Health Nurses 42:541-547.

Sutherland, VJ and CL Cooper. 1988. Sources of work stress. In Occupational Stress: Issues and Development in Research, edited by JJ Hurrell Jr, LR Murphy, SL Sauter, and CL Cooper. New York: Taylor & Francis.

Uehata, T. 1978. A study on death from overwork. (I) Considerations about 17 cases. Sangyo Igaku (Jap J Ind Health) 20:479.

—. 1989. A study of Karoshi in the field of occupational medicine. Bull Soc Med 8:35-50.

—. 1991a. Long working hours and occupational stress-related cardiovascular attacks among middle-aged workers in Japan. J Hum Ergol 20(2):147-153.

—. 1991b. Karoshi due to occupational stress-related cardiovascular injuries among middle-aged workers in Japan. J Sci Labour 67(1):20-28.

Warr, P. 1978. Work and Well-Being. New York: Penguin.

—. 1994. A conceptual framework for the study of work and mental health. Work Stress 8(2):84-97.
Wells, EA. 1983. Hallucinations associated with pathological grief reaction. J Psychiat Treat Eval 5:259-261.

Wilke, HJ. 1977. The authority complex and the authoritarian personality. J Anal Psychol 22:243-249.

Yates, JE. 1989. Managing Stress. New York: AMACON.

Yodofsky, S, RE Hales, and T Fergusen. 1991. What You Need to Know about Psychiatric Drugs. New York: Grove Weidenfeld.

Zachary, G and B Ortega. 1993. Age of Angst—Workplace revolutions boost productivity at cost of job security. Wall Street J,  10 March.