This meta-analysis reviews 79 studies (N = 46,605) that examined the existence of gender difference on intelligence in school-aged children. To do so, we limited the literature search to works that assessed the construct of intelligence through the Wechsler Intelligence Scales for Children (WISC) batteries, evaluating eventual gender differences…

We compared the Wechsler scores of individuals with twice-exceptionality (2e) and giftedness using a three-level Bayesian meta-analysis. Ninety-five effect sizes were calculated from 15 studies (n = 2,106). Results show that individuals with 2e who have learning disabilities perform lower than individuals with giftedness in Full-Scale Intelligence…

On the basis of several reviews of the literature, Lynn [Lynn, R., (2006). Race differences in intelligence: An evolutionary analysis. Augusta, GA: Washington Summit Publishers.] and Lynn and Vanhanen [Lynn, R., & Vanhanen, T., (2006). IQ and global inequality. Augusta, GA: Washington Summit Publishers.] concluded that the average IQ of the…

A systematic literature search for studies reporting effects of Early Intensive Behavioral Intervention identified 34 studies, 9 of which were controlled designs having either a comparison or a control group. We completed a meta-analysis yielding a standardized mean difference effect size for two available outcome measures: change in full-scale…

The classification of intelligence has been a prime interest to many for over three-quarters of a century. The Wechsler scales of intelligence and the development of factor analysis have both played major roles in the shaping of psychometric thought. An examination of this joint history by means of a review of the factor analytic studies of the…

This study was designed to examine Chicano and Anglo children's performance on several measures of field dependence/independence (FDI), including the Portable Rod and Frame Test (PRFT), the Children's Embedded Figures Test (CEFT), the Human Figure Drawing Task (HFDT), and the Block Design Test. Also examined was the relationship between FDI…

The third edition of the Wechsler Intelligence Scale for Children (WISC-III) is reviewed. A comparison of the WISC-III with the Weschler Intelligence Scale for Children-Revised (WISC-R) is included. Discusses shortcomings of the WISC-III while noting that overall, there are substantial improvements in the WISC-III over the WISC-R. (KW)

The efficacy of use of the Raven Progressive Matrices Test (RPM) in the selection of gifted children from traditionally underrepresented groups was investigated in a large-scale study with a diverse population. A total of 16,985 subjects were given the Raven Progressive Matrices Test. These included 22.7 percent Latinos, 37 percent Whites, 14…

This pair of studies investigated the psychometric adequacy of the Wechsler Intelligence Scale for Children - Revised (WISC-R) with a population of 8,396 potentially gifted elementary children of diverse ethnic and cultural backgrounds as well as diverse emotional and social environments. Study I showed subjects' profiles differed strikingly from…