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12.7 Chapter Summary
More psychologists are involved in the diagnosis and treatment of psychological disorder than in
any other aspect of psychology.
About 1 in every 4 Americans (over 78 million people) are estimated to be affected by a
psychological disorder during any one year. The impact of mental illness is particularly strong on
people who are poorer, of lower socioeconomic class, and from disadvantaged ethnic groups.
A psychological disorder is an unusual, distressing, and dysfunctional pattern of thought,
emotion, or behavior. Psychological disorders are often comorbid, meaning that a given person
suffers from more than one disorder.