The Raven Advanced Progressive Matrices Test (APM) is a well-known measure of higher order general mental ability. The time to administer the test, 40 to 60 minutes, is sometimes regarded as a drawback. To meet efficiency needs, the APM can be administered as a 30-or 40-minute timed test, or one of two developed short versions could be used. In…

This study examined the phenotypic and genotypic relationship between working memory speed (WMS) and working memory capacity (WMC) in 12-year-old twins and their siblings (N = 409). To asses WMS all children performed a reaction time task with three memory loads from which a basic mental speed measure and the derived slope were used. WMC was…

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…

The Wechsler Adult Intelligence Scale-Third Edition (WAIS-III; Wechsler, 1997b) provides factor-based index scores but allows only for pairwise comparison of these scores, producing inflated Type I error rates and reducing profile interpretability. This article provides tables for simultaneous comparison to the overall mean index score, thus…

Master Mind is a commercial game, popular in the 1970s, that has been extensively used in psychological and educational research. Here, a dynamic assessment format is developed in order to test metacognitive skills in individuals with mental retardation. The main objective is to obtain valid scores that adequately reflect individual differences…

A total of 378 Hong Kong adolescents estimated their own and their parents' IQ score on each of Gardner's 10 multiple intelligences: verbal (linguistic), logical (mathematical), spatial, musical, body-kinesthetic, interpersonal, intrapersonal, existential, spiritual and naturalistic. They answered three simple questions concerning intelligence and…

The impetus for our study was the contention of both Lynn [Lynn, R. (1991) "Race differences in intelligence: A global perspective." "Mankind Quarterly," 31, 255-296] and Rushton [Rushton, J. P. (1995). "Race, evolution and behavior: A life history perspective." New Brunswick, NJ: "Transaction"; Rushton, J.…

Substitution tests have a long history in psychology because of their simplicity of administration and their sensitivity to individual differences related to complex cognitive performance. Despite their widespread use there is no agreement on what the substitution test measures. The present study approached this question by applying a method of…

The present paper reports secular trends in the mean scores of a language, mathematics, and a Raven-like test together with a combined general ability (GA) score among Norwegian (male) conscripts tested from the mid 1950s to 2002 (birth cohorts approximately equal to 1935-1984). Secular gains in standing height (indicating improved nutrition and…

Three WISC-III protocols and a questionnaire were sent to individuals representative of varying levels and fields of education and who held different professional positions for scoring. Data analyses of the 126 sets of protocols revealed that the Comprehension, Vocabulary, and Similarities subtests were scored incorrectly most often. Analyses also…

Cognitive subtest scatter has often been considered to be diagnostically significant. The current study tested the diagnostic validity of four separate operationalizations of WISC-III subtest scatter: (a) range of verbal, performance, and full-scale subtests; (b) variance of verbal, performance, and full-scale subtests; (c) number of subtests…

The title of this essay, comes from the Sherlock Holmes mystery entitled "Silver Blaze," which refers the "curious incident" as to the absence of an expected reaction. In this article, the author discusses an essay that will examine such an absent reaction, or at least a muted one: the limited impact of early intelligence…