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abnormal behavior  Behavior that is deviant, maladaptive, or personally distressful. p. 393
agoraphobia  A cluster of fears centered around public places and being unable to escape or to find help should one become incapacitated. p. 401
anxiety disorders  Psychological disorders that include these features: motor tension, hyperactivity, and apprehensive expectations and thoughts. p. 400
bipolar disorder  A mood disorder characterized by extreme mood swings that include one or more episodes of mania. p. 412
catatonic schizophrenia  A type of schizophrenia that is characterized by bizarre motor behavior, which sometimes takes the form of a completely immobile stupor. p. 422
depressive disorders  Mood disorders in which the individual suffers depression without ever experiencing mania. p. 411
disorganized schizophrenia  A type of schizophrenia in which an individual has delusions and hallucinations that have little or no recognizable meaning. p. 421
dissociative amnesia  A dissociative disorder involving extreme memory loss caused by extensive psychological stress. p. 408
dissociative disorders  Psychological disorders that involve a sudden loss of memory or change in identity. p. 408
dissociative fugue  A dissociative disorder in which the individual not only develops amnesia but also unexpectedly travels away from home and establishes a new identity. p. 409
dissociative identity disorder (DID)  Formerly called multiple personality disorder, this is the most dramatic but least common dissociative disorder; individuals suffering from this disorder have two or more distinct personalities. p. 409
DSM-IV  Diagnostic and Statistical Manual of Mental Disorders, fourth edition; the APA's major classification of psychological disorders. p. 396
dysthymic disorder  A depressive disorder that is generally more chronic and has fewer symptoms than major depressive disorder. p. 411
etiology  The causes or significant antecedents of a disorder. p. 401
generalized anxiety disorder  An anxiety disorder that consists of persistent anxiety over at least 1 month; the individual with this disorder cannot specify the reasons for the anxiety. p. 401
learned helplessness  Occurs when individuals are exposed to aversive stimulation, such as prolonged stress, over which they have no control. The inability to avoid such aversive stimulation can produce an apathetic state of helplessness. p. 415
major depressive disorder  Indicated by a major depressive episode and depressed characteristics, such as lethargy and hopelessness, lasting at least 2 weeks. p. 411
medical model  A biological approach that describes psychological disorders as medical diseases with a biological origin. p. 394
obsessive-compulsive disorder (OCD)  An anxiety disorder; the individual has anxiety-provoking thoughts that will not go away (obsession) and/or urges to perform repetitive, ritualistic behaviors to prevent or produce some future situation (compulsion). p. 404
panic disorder  An anxiety disorder marked by the recurrent sudden onset of intense apprehension or terror. p. 401
paranoid schizophrenia  A type of schizophrenia that is characterized by delusions of reference, grandeur, and persecution. p. 422
personality disorders  Chronic, maladap-tive cognitive-behavioral patterns that are thoroughly integrated into the individual's personality. p. 425
post-traumatic stress disorder (PTSD)  An anxiety disorder that develops through exposure to a traumatic event, severely oppressive situations, severe abuse, and natural and unnatural disasters. p. 406
schizophrenia  A severe psychological disorder that is characterized by highly disordered thought processes. p. 420
undifferentiated schizophrenia  A type of schizophrenia that is characterized by disorganized behavior, hallucinations, delusions, and incoherence. p. 422







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