Examined data from 408 pairs of identical, same-sex fraternal twins at 14, 20, and 24 months to assess cognitive development and to identify genetic and environmental influences on phenotypic similarity. Found various patterns of development for separate constructs, for females versus males on each construct, and for individuals across constructs.…

Investigated genetic and environmental contributions to relationship between family and school environment and depressed mood; also potential sex differences in genetic and environment contributions to variation in and covariation between family connectedness, school connectedness, and depressed mood. Subjects were 2,302 adolescent sibling pairs.…

Evidence on the poorer spatial visualization ability in various Negro populations compared to the White populations and on the direction and magnitude of sex differences in spatial ability relative to other abilities suggests the genetic hypothesis that spatial ability is enhanced by a sex-linked recessive gene and that, since the 20-30 percent…

Implications for social policy are drawn from research supporting the conclusion that racial and sexual differences are less superficial and less labile than ordinarily thought. (GW)

Examined changes in intelligence in Negro children at ages 4 and 7 as a function of sex, home stability and educational level of their parents. Results were interpreted as supporting an interaction hypothesis concerning the relative effects of heredity and environment on intelligence. (DP)

In response to Francis Dunlop's paper, the author rejects a priorist verdict on the nature/culture controversy and argues its importance in prescription, explores the logic of the nature/culture interaction in humans, relates differential biology to differing male and female interests, and explores options for modifying sex-stereotyping through…

Examined divorce and gender as factors in racial differences in performance of elementary age children on Hahnemann Elementary School Behavior Rating Scale, Wechsler Intelligence Scale for Children-Revised, Wide Range Achievement Test, Vineland Teachers Questionnaire, and an interview. Found more racial group differences within the divorced…

Notes Halpern's general support for Casey's model. Addresses differences in Casey's and McKeever's findings on familial handedness and females' spatial ability by performing another experiment in which data are analyzed according to two different theoretical assumptions. Addresses the question of the heritability of handedness by noting that what…

An analysis of intelligence quotient (IQ) in relation to head size was performed on about 14,000 children aged 4 and 7 years, almost equally divided by race (white and black) and sex. Correlation between head size (by inference, brain size), and IQ is established as a within-families correlation. (SLD)

Explored aggression and delinquency in unrelated adoptive sibling pairs and biologically-related sibling pairs in the Colorado Adoption Project at 7, 9, 10, 11, and 12 years. Found that boys and adopted children were higher in externalizing behavior problems than girls and biologically related pairs. Sex differences in delinquency were more…

Tests indicate that females have innately less ability to perceive spatial relationships than males, but that proper training can improve spatial performance and reduce this natural disparity. (JD)

Criticizes the use of new biological theories of human behavior to inform educational policy. Discusses a study by Benbow and Stanley on differential math performance by boys and girls, to illustrate problems inherent in attempts to link a biological substrate with human achievement. (Author/GC)

This paper presents a model workshop focused on sex-typed behavior and developmental psychology, which is designed to examine the major theories based on biology, socialization or a complex developmental process. The materials concentrate on the three main theoretical approaches underlying the development of sex-role behaviors, i.e.,…

Examines the findings of 53 studies of sex differences in propositional logic, combinatorial reasoning, and proportional reasoning tasks. Finds sex differences for the latter two tasks to be vulnerable to Rosenthal's "file drawer" problem and effect size to be small for all tasks. Discusses possible explanations for sex differences in…

Asserts that it is irrational that the ideas of genetics should be used by some scientists to support the ideologies of racism and sexism. Whether the boundaries of women's "place in society" were erected with the "bricks of theology or the cement of genetic determinism," the intention is that the barriers shall remain strong. (Author/JM)