Geneticists discuss the Jensen paper and suggest upon reviewing the evidence, that the question of genetic differences between the IQ of blacks and whites cannot be answered in the present circumstances. (DM)

Results tend to agree with previous general population samples in not indicating any significant association between total IQ and season of birth. (Author/DB)

Four models of intellectual abilities were evaluated using confirmatory factor analysis and data from 197 children referred for a gifted program who took the Kaufman Assessment Battery for Children (K-ABC). All four models were a possible fit, but the best understanding came from a model posited on a theory of fluid-crystallized abilities. (SLD)

Studied whether mediated learning experience would improve the scores of African students on Raven's Standard Progressive Matrices. Seventy African and 28 non-African college students in South Africa were given the Raven's Progressive Matrices on 2 occasions, and some subjects were exposed to the mediated learning experience. Both groups improved…

Tested whether alpha power in different sub-bands is selectively related to intelligence. For 74 Austrian subjects, the EEG was recorded during a resting session and 2 different intelligence tests were performed. Findings show a strong positive correlation between intelligence and alpha power. (SLD)

The Wechsler Intelligence Scale for Children-Third Edition (WISC-III) and the Stanford-Binet Intelligence Scale-Fourth Edition (SB-IV), were administered to 20 gifted children and 20 non-gifted children to examine the extent of the difference in IQ scores obtained on the two tests. Results show that the SB-IV Composite Score was significantly…

Whether IQ level exerts a differential effect on the impairment of cognitive performance induced during acute hypoglycemia was studied for 24 nondiabetic adults. At various levels of hypoglycemia, no overall effect of IQ on deterioration was noted. Higher IQ did not apparently protect against adverse effects. (SLD)

D. K. Detterman and M. H. Daniel's recognition (1989) that intertest correlations for intelligence quotient (IQ) might not be uniform across the range of ability (and age) was anticipated by C. E. Spearman (1904). Detterman and Daniel appear to have rediscovered Spearman's suggested law of diminishing returns. (SLD)

An attempt to replicate the results with averaged evoked potentials (AEPs) of D. E. Hendrickson and A. E Hendrickson (1982) with 40 adults confirms a negative correlation between AEP variability and IQ. The Hendrickson paradigm is seen as no more than a well-controlled auditory evoked potential. (SLD)

Provides new confidence intervals for Wechsler Intelligence Scale for Children-Revised (WISC-R) to improve accuracy over existing tables. Includes alternative confidence interval tables for WISC-R quotients at extreme levels where current tables are least accurate. New tables center confidence intervals on estimated true intelligence quotient and…

Six abilities derived from the fluid and crystallized intelligence theory of J. L. Horn were studied with 1,193 individuals in age groups between 15 and 94 years. Results supported Horn's classification of crystallized and quantitative as maintained abilities and of fluid and broad visualization as vulnerable abilities. (SLD)

Tested 67 undergraduates on a new auditory inspection time task based on the ability to locate the left or right position of a stereophonic source and on a version of Raven's Progressive Matrices (Page and Crawford, unpublished). The new task appears to be accessible to a wider range of subjects than successive frequency discrimination tasks. (SLD)

Examined age changes in intellectual ability in the range from 16 to 89 years through 2 studies that involved IQs on the Wechsler Adult Intelligence Scale III (WAIS-III). Results are interpreted in the context of the fluid-crystallized intelligence theory of J. Horn. Studies used WAIS-III standardization data for 2,450 adults and longitudinal data…

Scores on cognitive tasks used in intelligence tests correlate positively with each other, that is, they display a positive manifold of correlations. The positive manifold is often explained by positing a dominant latent variable, the g factor, associated with a single quantitative cognitive or biological process or capacity. In this article, a…

The first objective of this study was establishing to what extent the development of metacognitive skills is associated with intellectual growth. As a second objective, the generality vs. domain specificity of metacognitive skills was investigated across age groups. A standardized intelligence test was administered to a group of first-year and…