Yearly cognitive tests were administered to adoptive and nonadoptive siblings between one and seven years of age and identical and nonidentical twins between one and three years. Results indicated that genetic influences are a source of continuity and change in mental development, whereas shared and nonshared environmental effects contribute to…

The author's previous article was intended to demonstrate that research on intellective sex differences (SDs) was incomplete because of a general preoccupation with SDs in means. SDs in central tendency and SDs in variability must be considered together to comprehend differences between male and female distributions in abilities. (SLD)

Historical discussions of the euthanasia or "lethal chamber" option in relation to people with mental retardation are presented. The paper concludes that eugenic beliefs in the primacy of heredity over environment and the positive role of natural selection may have condoned the poor conditions characteristic of large, segregated institutions and…

The futility of the debate between heredity and environment as determinants of intelligence is argued, with convictions inspired by C. Burt's work (apart from the question of fraud in his work). It is contended that the influence of this misconceived ideological disagreement is apparent in today's educational systems. (SLD)

Describes a biological and cultural framework that examines species-specific and culture-specific characteristics for the development of human emotions with evidence from Korea, China, and the United States. Discusses how emotions fall into broad families and dimensions across cultures, with both commonalities and differences. Notes that…

Examined influences on children's behavior problems in households defined by marital status and sibling relatedness. Found that genetic influences accounted for 81 to 94 percent of mean-level difference in behavior problems between two-parent/full sibling, and the mother-only/half sibling groups. Shared environmental influences accounted for 67 to…

Argues that an evolutionary account provides insight into developmental function and individual differences. Outlines some assumptions of evolutionary psychology related to development. Introduces the developmental systems approach, differential influence of natural selection at different points in ontogeny, and development of evolved…

Focuses on the reproduction of knowledge in science education and how socio-scientific issues are depicted/accounted for. Reviews contemporary epistemological questions of knowledge production. Outlines the Actor Network Theory (ANT), an alternative epistemology, describing the principal tenets using examples from the nature/nurture debate.…

Four studies with kindergarten through fifth graders and adults examined the development of reasoning about the origins of psychological traits. Results suggested an age-related increase in the tendency to distinguish among different psychological traits, and that over time, individuals come to believe that psychological traits are determined…

Presents evidence for four major design features of serial organization of speech arising from comparison of babbling and early speech with patterns in ten languages. Maintains that no explanation for the design features is available from Universal Grammar; except for intercyclical consonant repetition development, perceptual-motor learning seems…

Contrasts results of studies examining sex differences in intellectual functioning in the U.S. and Israel, in cities and on Kibbutzes. Findings indicate cross-cultural and intracultural influences challenge validity of theories that suggest a biological basis for sex differences in intellectual abilities. (SA)

Used the Sibling Inventory of Differential Experience with 396 adolescent and young adult children to determine the extent to which genetic differences between siblings or sibling differences in family constellation variables were responsible for differential experiences. (HOD)

New research shows that Japanese achieved significantly higher average IQ scores than did their American counterparts. These results provide the focus of a discussion on the nature/nurture controversey, validity of using IQ scores in comparing mental capacity of races and nationality groups, and other factors related to intelligence testing. (JN)

While some forms of test bias (for example, bias in selection and prediction) appear amenable to definitional consensus, a definition of cultural bias will remain problematic so long as it is confused with the nature/nurture issue. (Author/BW)

Presents longitudinal data regarding detrimental effects through 36 months of age on intellectual, behavioral, and social-interactional development in a nonsupportive caregiving environment, and the continuing amelioration of those effects in a supportive caregiving environment. Suggests that mothers of fetally malnourished infants may have had…