Twins regularly score nearly a standard deviation below the population mean on standardized measures of cognitive development in infancy but recover to the population mean by early childhood, making rapid gains through the toddler years. To date, only polynomial growth models have been fit to model cognitive recovery across childhood, limiting the…

This article analyses research of theories and models of intelligence. It examines current developments in intelligence research, covering the formation of more complex and diverse intelligence theories. First, the article examines some of the widely used aptitude/intelligence tests include, such Stanford-Binet Intelligence Quotient, Wechsler…

Interventions to enhance cognitive and executive function performance are essential for the child's performance in current and future occupations. Occupational therapy practitioners are critical members of early intervention, education, and healthcare teams. Practitioners are distinctly qualified to address cognitive functioning within the context…

Most of the individual difference variance in the population is found "within" families, yet studying the processes causing this variation is difficult due to confounds between genetic and nongenetic influences. Quasi-experiments can be used to test hypotheses regarding environment exposure (e.g., timing, duration) while controlling for…

The goal of this first major report from the Western Reserve Reading Project Math component is to explore the etiology of the relationship among tester-administered measures of mathematics ability, reading ability, and general cognitive ability. Data are available on 314 pairs of monozygotic and same-sex dizygotic twins analyzed across 5 waves of…

This study examined shared environmental influences on the longitudinal stability of general cognitive ability, as mediated by socioeconomic status and chaos in the home, using 287 pairs of elementary school-age twins drawn from the Western Reserve Reading Project (WRRP). General cognitive ability was evaluated at two annual assessments using the…

Evidence from intervention studies, quantitative genetic and molecular genetic studies suggests that genetic, and to a lesser extent, shared environmental influences are important to the development of reading and related cognitive skills. The Northeast-Northwest Collaborative Adoption Projects (N2CAP) is a sample of 241 adoptive families,…

Infants in a day care center were studied until age 36 months and tested periodically with the Bayley Scales, the Stanford-Binet, and the ITPA. Predictions of I.Q. were fulfilled much better than in previous studies and a constant environment was suggested as a contributing factor. (ST)

This paper was presented at the Biennial Meeting of the Society for Research in Child Development, Santa Monica, California, March 25-29, 1969. (DR)

It is generally accepted that Attention-Deficit/Hyperactivity Disorder (ADHD) results from a dysfunction of the central nervous system, which has led to a commonly held belief that environmental factors play little role in the behavioural problems of children identified as having ADHD. Therefore, the two studies reported in this article…

This study examined the relationship between infants' early physical environment and their subsequent performance on the Stanford Binet Intelligence Scale. A total of 23 infants were observed twice a month in their own homes starting at 12 months of age and continuing through 24 months of age. These observations were subsequently coded into 30…

In a longitudinal study of 89 black children from different social classes, while there were no significant SES differences on the Cattell Infant Intelligence Scale at 18 and 24 months of age, there was a highly significant 23 point Mean IQ difference between children from welfare and middle class black families on the Stanford-Binet at 3 years of…

Intelligence tests, particularly the Stanford-Binet, have been much abused and unintelligently misused. If the results of such testing are used for the purpose for which they were designed and are interpreted carefully and accurately, then the results can be used to indicate what kind of teaching methods should be utilized; what kind of cognitive…

Examined theoretical model of early environmental action of 282 Caucasian and African American infants, using structural equation modeling. Model included socioeconomic status, early cognitive status, stimulation with home environment, parental use of negative control, and later cognitive status. Models for males and females showed similar…

In an effort to isolate the emergence and causes of social class differences in intellectual performance, this longitudinal study was undertaken as a follow-up on a cross-sectional study that yielded no social class differences on the Cattell Infant Intelligence Scale for 12-, 18-, and 24-month-old black children. In the present study, 89 children…