Ronald C. Johnson argued that if early environmental stimulation or deprivation has a significant effect on intellectual ability, then individuals who are genetically identical and who are exposed to a common early environment should resemble one another more closely in IQ than similar individuals who have not shared a common environment. Johnson…

Contents of this symposium comprises: Introduction (W. B. Dockrell); The Genetics of Intelligence (Sir C. Burt); Structuring Mental Acts (P. R. Merrifield); A "Piagetian" Test of Cognitive Development (R. D. Tuddenham); The British Intelligence Scale (R. W. Warburton); Intelligence (P. E. Vernon); Hierarchical Theories of Mental Ability…

From the monthly Saturday Review supplement, "Education in America, sponsored by the Charles F. Kettering Foundation.

Pychologists, educators, and others have challenged the idea of a fixed IQ. This book uses recent research and earlier discoveries to argue that intelligence is not genetically set. Noting that the idea of learnable intelligence reflects the belief that intelligence can be taught, the book outlines a theory of learnable intelligence, including…

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…

Reviews the current theories concerning individual differences in cognitive functioning. While some argue that heredity places a genetic cap on intellectual development, others emphasize the dynamic interrelationship between cultural and environmental factors. Concludes that intelligence is more complex than the heredity advocates allow. (MJP)