Sex differences on an adaptation of the Digit Symbol subtest of the Wechsler Intelligence Scale for Children-III.

To make the Digit Symbol subtest of the Wechsler Intelligence Scale for Children-III more useful in neuropsychological assessment, the measurement and influence of motor speed and incidental learning on subjects' performance was examined. Analysis indicated that motor speed but not incidental learning were significant influences on scores. Statistically significant differences between 150 males (M age 12.3 yr., SD = 2.8) and 150 females (M age 12.1 yr., SD = 2.7) were obtained for both raw and scaled scores on the Digit Symbol subtest. The implications of these gender differences are discussed as a possible example of differences in executive function.