Heredity and Environment in the Growth and Decline oflntelligence

Philip E. Vernon
Though we can describe the characteristics of mental growth in childhood and mental decline in old age, there are great difficulties in demonstrating the main causal factors. A stimulating or a deprived environment has greater effects on the development of intelligence than used to be believed; but there are also strong grounds for recognizing that genetic differences, which underlie biological maturation and decay, determine human capacities to a large extent.
This data repository is not currently reporting usage information. For information on how your repository can submit usage information, please see our documentation.