Data from the national standardization of the French version of the WISC-III were analyzed to determine when during childhood the IQ-related process of differentiation appears and how the strength of the relationships among subtests evolves with age in low- and high-IQ groups. Indeed, some recent studies suggest that age might moderate the effect…

The cognitive profiles of 161 gifted children--those with a Full Scale, Verbal, and/or Performance IQ of 130 or higher on the Wechsler Intelligence Scale for Children, Third Edition (WISC-III; Wechsler, 1991)--were examined. It was hypothesized that this population of very intelligent children would demonstrate much larger Verbal-Performance…

Examination of measurement invariance tests the assumption that the model underlying a set of test scores is directly comparable across groups. The observation of measurement invariance provides fundamental evidence for the inference that scores on a test afford equivalent measurement of the same psychological traits among diverse groups. Groups…

The new paradigm of evolutionary social science suggests that humans adjust rapidly to changing economic conditions, including cognitive changes in response to the economic significance of education. This research tested the predictions that cross-national differences in IQ scores would be positively correlated with education and negatively…

Lynn [Lynn, R., 2002. Sex differences on the progressive matrices among 15-16 year olds: some data from South Africa. "Personality and Individual Differences 33," 669-673.] proposed that biologically based developmental sex differences produce different IQ trajectories across childhood and adolescence. To test this theory we analyzed the…

THIS TEST WAS DEVELOPED TO MEASURE THE INTELLIGENCE OF BLIND ADOLESCENTS AND ADULTS. SIX HUNDRED AND THIRTY BLIND SUBJECTS 14 YEARS OF AGE AND OLDER WERE USED IN REFINING AND STANDARDIZING THE NONVERBAL, PERFORMANCE OHWAKI-KOHS BLOCK DESIGN TEST FOR USE BY BLIND INDIVIDUALS IN THE UNITED STATES. RESULTS INDICATED STATISTICALLY SIGNIFICANT…

Assessed correlation and discrepancy scores among Wechsler intelligence and memory quotients in 126 closed head injured (CHI) adults. Results indicated a slight generalized decrease in CHI patients' mean level of performance. A significant correlation was obtained between patients' intelligence and memory quotient scores. Discrepancy scores were…

Using the Terman files, 26 subjects with scores above 180 IQ were compared with 26 randomly selected subjects from Terman's sample. Findings were generally that the extra IQ points made little difference and that extremely high IQ does not seem to indicate "genius" in the commonly understood sense. (Author/CL)

Discusses distinction between statistically significant Verbal-Performance IQ discrepancies and frequencies with which such differences occur in Wechsler Adult Intelligence Scale-Revised (WAIS-R) standardization sample, and compares statistically derived and empirically observed WAIS-R Verbal-Performance IQ frequencies. Delineates implications for…

A comparison of the Wechsler Intelligence Scale for Children-Revised (WISC-R) and the Kaufman Assessment Battery for Children (K-ABC) with 37 mentally retarded children revealed that the WISC-R Full Scale IQ resulted in scores significantly lower than the K-ABC Mental Processing Composite. (CL)

Examined the standard error for short forms of Wechsler's scales with deviant subjects (N=2000). Demonstrated that the standard error of estimate of a short form for the standardization sample is an excellent approximation to the standard error of a predicted IQ for a new, even markedly deviant, subject. (LLL)