Paper presented at the Merrill-Palmer Conference on Research and Teaching of Infant Development, February 13-15, 1970. (JE)

Data are presented from families of monozygotic twin pairs which give evidence of genetic variance on the Block Design Test, a nonverbal measure of intelligence. Analyses of genetic and environmental effects on behavior are possible with this kind of information. (SA)

Theories are discussed concerning the relative significance of biological and environmental issues to giftedness, with discussion organized into the "onset" period of the late nineteenth century, with contributions by Charles Darwin, Frances Galton, and Karl Pearson; and the "flowering" period of the early twentieth century with Lewis Terman. (JDD)

Presents some of the concepts being developed by evolutionary thinkers to explain how animals deal with varying conditions in their environments. Discusses the environmental perspective. Explains why it involves more than predetermined behavior and that evolutionary theories now include developmental and environmental variables. (Author/JS)

Although it is difficult to ascertain precisely the time at which the study of individual differences became recognized as a specialty within the psychological sciences, there appears to be much agreement among historians that its development was fostered primarily within the United States during the late 19th century. This paper examines the…

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)

Areas of agreement and disagreement concerning intellectual developmental and the problems of mental retardation espoused by the author and by Uzgiris are discussed in this paper. The importance of environmental factors, along with the genetic and/or constitutional nature of the organism on which these environmental events impinge, is seen as…

This issue of the IRCD Bulletin is devoted to commentaries on an article by Arthur R. Jensen on the nature-nurture controversy in a recent number of "Harvard Educational Review." Contents of the Bulletin are comprised of the following: "Education, Ethnicity, Genetics and Intelligence; Jensenism: Another Excuse for Failure to…

Much of our thinking about contemporary social problems reflects tacit presuppositions regarding the operation of heredity and environment in human behavior. These beliefs have important implications for practical decisions. Advances in genetics, psychology, anthropology, and other disciplines have contributed much to a clarification of the…