Intellectual engagement (IE) refers to enjoyment of intellectual activities and is proposed as causal for knowledge acquisition. The role of IE for cognitive development was examined utilizing 2-year longitudinal data from 112 ninth graders (average baseline age: 14.7 years). Higher baseline IE predicted higher baseline crystallized ability but…

This study examines development along Perry's intellectual and ethical scale among three successive graduating classes of students identified as gifted and talented in mathematics and science. Perry posits that intellectual development proceeds from a basic dualism through nine stages ("positions") and culminates with a sense of personal identify…

In a discussion of psychological development separate sections are devoted to (1) biological and cultural influences on development, (2) development in infancy, early childhood, middle childhood, and adolescence, (3) physiological foundations of behavior, (4) motivation and cognitive development, (5) intellectual development, (6) imagination and…