Anhedonia
Inability to experience pleasure due to impairment or dysfunction of normal psychological and neurobiological mechanisms. It is a symptom of many PSYCHOTIC DISORDERS (e.g., DEPRESSIVE DISORDER, MAJOR; and SCHIZOPHRENIA).
Affective Symptoms
Schizotypal Personality Disorder
A personality disorder in which there are oddities of thought (magical thinking, paranoid ideation, suspiciousness), perception (illusions, depersonalization), speech (digressive, vague, overelaborate), and behavior (inappropriate affect in social interactions, frequently social isolation) that are not severe enough to characterize schizophrenia.
Schizoid Personality Disorder
Philosophy
Reward
An object or a situation that can serve to reinforce a response, to satisfy a motive, or to afford pleasure.
Affect
Irritable Mood
Depressive Disorder, Major
Marked depression appearing in the involution period and characterized by hallucinations, delusions, paranoia, and agitation.
Depression
Depressive states usually of moderate intensity in contrast with major depression present in neurotic and psychotic disorders.
Schizophrenia
Self Stimulation
Expressed Emotion
Frequency and quality of negative emotions, e.g., anger or hostility, expressed by family members or significant others, that often lead to a high relapse rate, especially in schizophrenic patients. (APA, Thesaurus of Psychological Index Terms, 7th ed)
Psychiatric Status Rating Scales
Motivation
Immobility Response, Tonic
Emotions
Sucrose
Subliminal Stimulation
Dysthymic Disorder
Chronically depressed mood that occurs for most of the day more days than not for at least 2 years. The required minimum duration in children to make this diagnosis is 1 year. During periods of depressed mood, at least 2 of the following additional symptoms are present: poor appetite or overeating, insomnia or hypersomnia, low energy or fatigue, low self esteem, poor concentration or difficulty making decisions, and feelings of hopelessness. (DSM-IV)
Psychotic Disorders
Depressive Disorder, Treatment-Resistant
Social Behavior Disorders
Behaviors which are at variance with the expected social norm and which affect other individuals.