This paper is intended to aid interpretation of intelligence tests in light of neurological findings and to suggest future test designs which would reflect cerebral hemisphere specialization. The need is emphasized for improved measures of right brain functioning, especially for Blacks, who exhibit some degree of right hemisphere preference. (SJL)

Intended as a nontechnical review of current scientific knowledge in the field, this essay considers the nature of primary and secondary intellectual abilities, plus the major features of, and the development of individual differences in, the skills and capacities constituting intelligence. Part of a theme issue on intelligence. (Author/SJL)