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An "Instantaneous" Estimate of a Lifetime's Cognitive Change
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Deary, Ian J.; Whalley, Lawrence J.; Crawford, John R. – Intelligence, 2004
Change in cognitive functioning is an important aspect of human aging and a key outcome in many medical conditions. However, cognitive change can rarely be measured directly, since prior cognitive data do not exist for most people. We examined the criterion validity and one-year stability of the difference between National Adult Reading Test…
Descriptors: Aging (Individuals), Test Validity, Cognitive Ability, Older Adults
The Modification of Intelligence through Early Experience.
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Ramey, Craig T.; Haskins, Ron – Intelligence, 1981
Infants judged to be at risk for subnormal intellectual growth were randomly assigned to experimental and control groups which varied as to educational curriculum activities. Two types of evidence, group differences and parent-child IQ correlations, demonstrate the importance of early environments in intellectual development. (Author/RD)
Descriptors: Control Groups, Day Care, Developmental Programs, Early Experience
Correlations of Mental Tests with Each Other and with Cognitive Variables Are Highest for Low IQ Groups.
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Detterman, Douglas K.; Daniel, Mark H. – Intelligence, 1989
Two studies (N=4,261 persons) illustrate an inverse relationship between ability level and correlations among IQ measures. Low IQ subjects showed higher correlations than did high IQ subjects. Intercorrelations of IQ subtests, intercorrelations of cognitive ability measures, and correlations of IQ with measures of cognitive ability displayed the…
Descriptors: Cognitive Ability, Cognitive Tests, College Students, Comparative Testing