SOCI 310 Lecture Notes - Lecture 14: Ecological Study, Schizophrenia, Twin
9 Mar 2016
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Document Summary
Schizophrenia is a clinical syndrome characterized by psychotic symptoms, negative symptoms and cognitive impairments, which usually evolves in adolescence or early adulthood and results in long-lasting psychosocial impairment. Psychosis is a clinical state characterized by hallucinations or delusions in which the individual is unable to differentiate his own thought processes from reality. While psychosis is inherently part of the schizophrenia syndrome, it can also occur in a variety of related conditions. Debate about validity and usefulness of the schizophrenia construct with increasing emphasis on symptom dimensions and the notion of continuum. Most influential study of the incidence of schizophrenia uniform methodology across 12 sites/10 countries. Narrow criteria 7 to 14 per 100, 000 person-years. Broad criteria 16 to 42 per 100, 000 person-years. The evidence points to the singular conclusion that, contrary to almost any other common condition; the incidence of schizophrenia is independent of the environment and a characteristic of human populations.
