Evidence from cross cultural studies and observational studies are provided to support the contentions that males are more aggressive than females and that this sex difference is evident as early as the preschool years. (Author/MP)

This study of 11 3-generation families supported the hypothesis of autosomal dominant inheritance with reduced penetrance. Data did not support an increased frequency of males, left-handedness, or autoimmune disorders in dyslexics. Severity was greater in males. Long-term outcome was comparable in dyslexics and nondyslexics. (JDD)

To account for observed sex differences on tasks such as the rod and frame test, the embedded figures test, and other related measures, the theory is advanced that a sex-linked recessive gene mediates or facilitates certain performances. This assumption is coupled with the concept of "a mixture of density functions" to provide a…

Biological differences between the sexes in motor, sensory, and some intellectual abilities are reviewed. The skills that lead to early success in school draw on female talents; as a result, boys are often labeled hyperactive. Journal availability: Human Nature, Inc., Subscriptions Department, P.O. Box 10702, Des Moines, Iowa 50340; single copy…

This study evaluated the influence of biological and environmental variables on the differences between the throwing performance of 100 five-year-old girls and boys. Results are analyzed and discussed. (Author/MT)

Reasserts criticism of much psychomedical research on sex differences in terms of the researchers' failure to consider important sociological factors, their drawing of firm conclusions from inadequate data, and the vast social and political consequences of their work. (CMG)

Critiques an environmentalist view of the effects of nature and nurture on behavior. Argues for an interactionist position in which nature and nurture are totally and inextricably involved in each and every organismic response. (MP)

The deportment of each student in a third-grade classroom was rated by the teacher before and after the fall change from daylight savings time, to see if this disruption in circadian rhythms alters behavior. The deportment of boys improved significantly while the deportment of girls was significantly disrupted. (Author/SJL)

Discusses recent research findings, which do not appear to support the idea that boys' superiority in mathematics is biological. Cerebral lateralization studies are discussed; meta-analysis showed that the gender gap has narrowed, casting doubt on the importance of innate ability determining mathematics performance. Discusses implications of…

The article notes correlations between lefthandedness and the incidence of immune disorders (such as ileitis, colitis, celiac disease, and Hashimoto's thyroiditis), with learning disorders and with early grey hair. Eventual control of the hormonal and immune environment (in addition to educational intervention) may prevent or minimize these…

Related blood levels of testosterone and sex hormone-binding globulin in pregnant women to gender role behavior among 342 male and 337 female offspring at 3.5 years. Found that testosterone levels related linearly to girls' gender role behavior. Neither hormone related to boys' gender role behavior. Other factors, including older brothers or…

Discusses the continuing debate over the existing social relations between the sexes; that is, whether subordination of females to males is derived from biological differences or is brought about as a result of the existing social structure. (SB)

Reports two studies in which 12- to 13-year-old girls, half of whom were premenarcheal and half postmenarcheal, responded to pictures of infants. Concurrent assessments of interest in motherhood, cognitive sophistication about the relationship between menarche and childbearing, attitudes toward menarche, and sex-role self-image did not…

This study discusses the behavior of the females of the parasitic wasp Nasonia vitripennis, which adjust the sex ratio of their broods according to whether or not they are the first or second wasp to parasitize a host. The results provide a quantitative test of sex ratio theory. (Author/SA)

To study whether individual differences in general cognitive ability differ in males and females, full-scale IQ data from 426 child twin pairs were fitted to a structural equation model of sex limitation. Individual differences in general cognitive ability appear to be substantially due to common genetic influences in males and females. (SLD)