The differential impact of birth order and IQ on sibling roles were examined with particular interest focused on achievement outcomes. Subjects were a stratified sample of 37 pairs of near-in-age siblings, all within the normal range in personality and IQ, but differing significantly in scores on the Slosson IQ Test. Results indicate that when the…

This paper presents the results of a study which examined heritability ratios for the major ethnic and socioeconomic groups in the Los Angeles Unified School District. Scores on three measures (the Cooperative Primary Reading Test, the Comprehensive Test of Basic Skills, and a composite set of intelligence tests) were compared for twins from…

A private corporation conducted a study for the United States Air Force in 1973, investigating the long term effects of drug use on general mental ability. The air force personnel selected for participation in the study were 3741 known drug users and 6772 controls. Subjects received requests to sign a form allowing their high schools to release…

Administered the Hooper Visual Organization Test (VOT) to 54 elementary students referred for psychometric evaluation. Results showed no significant relationship between sex and VOT scores, but age and IQ were significant correlates. (JAC)

Evaluated demographic and developmental differences in case studies of disturbed children (N=58) who were treated with developmental therapy. Results indicated children differed in age, intelligence, and mother's employment status. Although all children progressed in behavior, communication, socialization, and academics, no difference was found in…

The hypothesis that racial differences in IQ stem from differences in components of executive systems including knowledge base, control processes, and metacognition was investigated. Group differences in metamemory, strategy use, and general knowledge, but not perceptual efficiency, were observed. Metamemory predicted crystallized but not fluid…

Investigated whether attitudes toward school mathematics on mathematical achievement differed between low and high intelligence eighth-grade students in three Japanese schools (N=808). Results indicate that the attitude of low intelligence students is more important and it affects more in magnitude than that of high intelligence students. (JN)

Explores the generality of findings relating intelligence to Inspection Time (IT), the exposure necessary to judge which of two lines is longer, in two studies using normal children and mentally retarded adults. Results showed the relationship between IT and performance IQ was lower in the mentally retarded group. (JAC)

Investigated whether assertive and nonassertive individuals differ in defense mechanisms they most typically rely on when confronted with interpersonal stress and conflict. Results indicated assertive males and females both endorsed the most adaptive defense mechanism cluster, whereas nonassertive males and females endorsed more primitive defense…

The effects of social reinforcement on two motor tasks by 40 retarded adolescents with high (8.09 yr.) and low (5.45 yr.) mental ages was investigated. Social reinforcement influenced persistence but not speed of performance. The effectiveness of praise on retarded subjects' performances varies with the type of motor task used. (Author/RD)

Three studies of college students found a sex difference in the correlation of memory scanning rate, short- and long-term components of free recall, and word recognition with memory span. Findings are discussed in terms of prior work and a theory presented to account for the obtained sex differences. (Author/RD)

Indices of scatter on the WISC-R and McCarthy Scales were examined for 20 educable mentally retarded and 20 learning disabled children in relation to 20 matched controls and to standardization samples. Exceptional children exhibited more subtest scatter and variability than the standardization sample but not more than the control group. (Author/RD)

Compares a group of 32 toddlers with employed mothers with a matched group of 38 toddlers with nonemployed mothers in order to examine the effect of maternal employment on the development of the child. While no differences were found between the two groups in language development and emotional adjustment, children of employed mothers were more…

Very close age spacing was an obstacle to high academic performance for later borns. In family relations and self-esteem, first borns scored better and performed in school as well as their potentially much more able younger siblings, regardless of age spacing. (Author)

Performance differences between 10 nonretarded children and 10 moderately/severely retarded adolescents on a manual control task were examined. Results suggested that the ability to discriminate internal cues is related to IQ differences. (Author)