A sample of 21 guidance counselors was administered the full battery of Johnson O'Connor Research Foundation aptitude tests to compare scores with the "general population" (norm group). The counselors had worked in public schools, private schools or as self-employed consultants for an average of 10 years. The average age was 42. The tests, which…

Sources of continuity among nine measures of infant cognitive processing and later childhood intelligence quotient were examined through developmental structural equation models applied to a sample of 208 twin pairs measured from 7 to 36 months. Skills assessed appear related to general cognitive ability in a relatively unstable manner. (SLD)

Cognitive changes in college students from early in the freshman year to the end of the sophomore year were assessed using a pretest-posttest design. In all, 135 university students completed both a pretest and a posttest. The academic achievement measure used was the College Basic Academic Subjects Examination (CBASE), a test intended to assess…

Sex differences in variability in the national norms of the Differential Aptitude Tests, Preliminary Scholastic Aptitude Test/Scholastic Aptitude Test, Wechsler Adult Intelligence Scales, and California Achievement Tests were examined. Compared to females, males were consistently more variable in quantitative reasoning, spatial visualization,…