This study investigated the systematic rise in cognitive ability scores over generations, known as the "Flynn Effect," across middle childhood and early adolescence (7-15 years; 291 monozygotic pairs, 298 dizygotic pairs; 89% White). Leveraging the unique structure of the Louisville Twin Study (longitudinal data collected continuously…

The Wechsler Preschool and Primary Scale of Intelligence, 4th ed. includes two measures of working memory normed on children 2;6-7;7. The present analyses of the typically developing children (N = 1,591, 812 female, 779 male, with an ethnic distribution approximating the United States) provide new, theoretically important information about these…

Cognitive impairment is common among children born very preterm (VPT), yet little is known about how this risk changes over time. To examine this issue, a regional cohort of 110 VPT (= 32 weeks gestation) and 113 full-term (FT) born children was prospectively assessed at ages 4, 6, 9, and 12 years using the Wechsler Preschool and Primary Scale of…

The purpose of this study was to empirically examine the dimensionality of language ability for young children (4-8 years) from prekindergarten to third grade (n = 915), theorizing that measures of vocabulary and grammar ability will represent a unitary trait across these ages, and to determine whether discourse skills represent an additional…

The verbal, performance, and full-scale IQs of the standardization sample for the Wechsler Intelligence Scale for Children--Revised (WISC-R) were analyzed according to sex, race, geographic region, parental occupation, and type of residence (urban or rural) and compared with corresponding data from a 1950 study of the WISC standardization sample.…

By nonintellective" are meant factors which are present in a test situation and which influence the test scores obtained but are not obviously related to the skills or knowledge ostensibly being measured by the test. (Authors)

The relationship between preschoolers' motivation and performance and observed paternal behavior is explored. (JMB)

Game-like and test-like methods of divergent thinking assessment were compared with 10-year olds. Effects of method on score correlates were sufficient to allow the possibility that method may be implicated in outcomes of many studies of divergent thinking. (Author)

Examined differences in intelligence test scores of black and white five-year-olds born premature with low birth weight. Found that black children's IQ scores were 1 SD lower than those of white children. Adjustments for ethnic differences in poverty reduced the differential by half; adjustments for differences in home environment reduced it by…

Examined relations among measures of child language derived from observations of 20-month-olds' speech with mothers, experimenter assessments, and maternal reports. Found that structural equation modeling supported strong relations among the three sources, the loading of multiple measures on a single latent construct of vocabulary competence, and…