Evidence from twin studies points to substantial environmental influences on intelligence, but the specifics of this influence are unclear. This study examined one developmental process that potentially causes intelligence differences: learning to read. In 1,890 twin pairs tested at 7, 9, 10, 12, and 16 years, a cross-lagged…

Four basic assumptions of IQ tests - age constancy, scholastic validity, standard environment and performance suggiciency are alien to Piaget's theory. Heredity cannot be statistically separated from environment; therefore, Piagetian theory would suggest the nature-nurture controversy is devoid of meaning. (ST)

Virtual twins are unrelated siblings of the same age who are reared together from early infancy (UST-SA). Study uses a sample of 90 UST-SA pairs to comparatively assess the similarity of IQ subtest profile correlations for UST-SAs and twin pairs. Findings support explanatory models of intelligence that include genetic factors, demonstrating that…

This publication is composed of a collection of articles based on the ideas produced and presented at two conferences on productive thinking. Intended, overall, to introduce new concepts of intellectual abilities, the book is divided into four parts: Part I describes a considerable amount of the significant research in "Intelligence and Its…

The waste of human intellectual resources resulting from the dynamics of early nutritional deprivation is a serious social and public health problem. An undernourished child develops more slowly, demanding and receiving less attention than a well-nourished child, and is thus less able to compete in school and in society in general. (Author/GC)

Based on the premise that the brain is a highly plastic, constantly changing entity that is powerfully shaped by experiences in childhood and throughout life, this book presents information on enriching childhood brain development. Each stage of childhood development is profiled, with the changes in the brain described and their implications for…

Support for the confluence model of intellectual development has come from analyses of family size-birth order means of large aggregate data sets. Analyses of individual scores do not substantiate the confluence model, as explained variance is markedly reduced. The study of family interaction variables utilizing longitudinal data is recommended.…

Discussed are issues involved in testing the mental abilities of nonWestern, nonurban ethnic groups. Within this context the paper reviews conceptions of intelligence and intellectual potential, prediction under fixed and adaptive conditions, the question of environmental influences, and some formal test factors. Examples are drawn from African…

The present investigation examined the ability of the Inventory of Home Stimulation (STIM) to predict changes in relative mental test performance of children between 6 months old and 36 months of age. The six STIM subscales were used in discriminant analysis to classify infants into three groups (gainers, stable, losers) in terms of their change…

Examined effects of different environmental measures on individual intellectual growth patterns. Growth curve analyses revealed that HOME scores exerted a constant influence on the expected composite, verbal, and nonverbal intellectual skills at each age. Only SES influenced the rate of growth, specifically nonverbal intellectual skills. (Author)

CURRENT RESEARCH INDICATES THAT SCHOOL AND HOME ENVIRONMENTS STRONGLY INFLUENCE AN INDIVIDUAL'S INTELLECTUAL DEVELOPMENT, ALTHOUGH CERTAIN VERY BROAD HEREDITARY LIMITATIONS MAY ALSO AFFECT IT. THE ECONOMICALLY AND EDUCATIONALLY DISADVANTAGED YOUTH EXPERIENCES AN ENVIRONMENT WHICH LACKS STIMULI ESSENTIAL TO POSITIVE INTELLECTUAL GROWTH AND…

This paper examines evidence supporting the hypothesis that environment differentially affects intelligence in a sex-specific manner. The current position that environment and heredity contribute interactively to intelligence obscures the greater vulnerability and exposure of males to environmental influences and the reciprocal lack of equivalent…

The nature and specification of goals in teaching a group of concepts affect the type and quality of learning. What is learned is learned as a means to some end. Feedback from end to means regulates learning a given activity. The task or goal structure provided by the environment may play its most important role early in life and gradually decline…