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Examines the roles of epigenetic factors in psychiatric disorders. Transmission disequilibrium test; Brain-derived neurotrophic factor; Sex effects in genetic anticipation studies of schizophrenia.

Introduces studies of criminality, delinquency, and violence from a behavioral genetic viewpoint as an addition to C.S. Widom's review published in the 1989 issue of the `Psychological Bulletin' entitled `Does violence beget violence? A critical examination of the literature.' Her review omitted references to the relevant biological and genetic literature. Genetic studies of delinquency and criminality; Physiological studies of aggression; More.

Argues that the complexities of genotype-environmental relations have been addressed in psychology. Difficulties arising from psychologists' interests in individual differences in behavior; The difficulties of studying genetic and environmental determination of the development of individual differences; Duckling sensitivity to maternal chicken calls; Intelligence; The causes of canalization in humans; More.

Presents a study of the salient characteristics of group Minnesota Multiphasic Personality Inventory (MMPI) data collected in the past four decades, a comparison of three commonly used statistical methods, and a further examination of the predictive power of MMPI scale elevations associated with diagnostic group membership. Method; Results; Discussion.

Psychologists' ratings of infant and childhood behavioral style, or temperament, made during the course of the nationwide Collaborative Perinatal Project supplied the raw data for the largest longitudinal twin study yet reported on this topic. The behavioral ratings are available for ages 8 months, 4 years, and 7 years on approximately 350 twin pairs. These ratings were factor analyzed, and co-twin similarity for identical and fraternal twins was examined at each age. The most salient results were as follows: (1) At 8 months, individual differences in a broadly based "activity" factor showed evidence of moderate genetic influences, (2) at 4 years, IQ showed appreciably greater familial influence than any of the composites of temperament ratings, but significant genetic effects were apparent for "task persistence" and "irritability" factors, and (3) some evidence for genetic effects on "active adjustment" and "fearfulness" factors was present at 7 years. A general conclusion for all ages is that nonfamilial sources account for at least one-half of the observed variance. No strong evidence for sex differences emerged from the analyses. [ABSTRACT FROM AUTHOR]

Analyzes the association betweens schizophrenia and the polymorphism of the polyglutamine repeat sequence of hSKCa3 gene. Repeat length; Transmission Disequilibrium Test; Family-based association analysis of hSKCa3 polymorphisms.