Lynn [Lynn, R., 2002. Sex differences on the progressive matrices among 15-16 year olds: some data from South Africa. "Personality and Individual Differences 33," 669-673.] proposed that biologically based developmental sex differences produce different IQ trajectories across childhood and adolescence. To test this theory we analyzed the…

Finds that extraverted children did better than introverted children on both a nonverbal coding task and simple and complex verbal fluency tasks. Notes that anxiety influenced girls' performances on the more complex verbal fluency task, but did not alter boys' performances. Compares these findings to those of similar studies of adults. (RL)

This article describes the Comprehensive Test of Nonverbal Intelligence, an assessment designed to evaluate the intellectual ability of students ages 6 to 18.11 years for whom other mental ability tests are inappropriate or to enable comparisons between verbal and nonverbal intellectual ability. Its administration, standardization, reliability,…