Piaget has stated that the child's active manipulation of objects is a necessary part of teaching for intellectual development. But this appears to be contrary to empirical evidence. From a review of literature, it is concluded that Piaget's insistence on physical activity, and his dismissal of observation, are excessive. (Editor)

Correlations between extraversion and ability typically change from positive to negative at about 13-14 years. A method for analyzing this change is developed and applied to Rushton's (1969) data from his longitudinal study of 266 children of above-average intelligence, whom he tested at 10-11 years and again at 15-16 years of age. (Editor)

Results of analysis of correlations collected by Cookson, following Eysenck and Cookson's study of personality and ability in young people, confirm the finding from previous Cattellian test data that the more intelligent children decline in relative extraversion scores and cast doubt on Eysenck's suggestion that introverts gradually show higher…