In our prior study the negative correlation between Topology, a behavioral measure of fluid reasoning, and adult age diminished with the increase in the level of expertise in a cognitively-demanding domain of expertise in the game of GO. The present fMRI study was designed to investigate neural substrates of Topology. The modified topology…

Argues that despite aberrations, false starts, misapplications, and unfortunate crystallizations of methods and interpretations, the differential psychology of cognitive abilities is an important part of psychological knowledge about human beings. (Author/GC)

A brief discussion of theories of general intelligence precedes a report of relevant empirical data. Results from the factor analysis of more than 20 sets of Wechsler Adult Intelligence Scale (WAIS) data indicate that the WAIS clearly is not a one-factor scale. It does not measure a single, general intelligence. Roughly 17 percent of the reliable…

The author reviews cross-sectional and longitudinal studies on the status of intelligence in the aging, and finds conflicting conclusions: (1) intelligence does decline as persons grow older; (2) only some aspects decline while others improve; and (3) intelligence does not decline. Certain factors are adduced to suggest that such…

Results indicated two broad factors of intelligence, interpreted as fluid intelligence and crystallized intelligence, coordinated with two broad factors of short-term learning, interpreted as indicating primary memory and secondary acquisition. (Author/RC)

A battery of 16 newly devised tests intended as measures of "fluid" intelligence were administered, together with a number of other measures, and factor analyzed separately for a sample of Black children and a sample of White children. The results were judged to confirm the construct of fluid intelligence. (CTM)

Five major trends in the study of intellectual abilities are identified. These suggest that in the future several kinds of tests will be used to measure several kinds of basic processes of intelligence. There will be a corresponding decrease in concern to measure a single attribute of general intelligence. (Author/RD)

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)

The state of research on intelligence is reviewed in an editorial. The author notes conceptual, measurement, and data analysis problems. Suggestions as to how research on intelligence can be improved are provided. (RD)

Studies on visual, musical, and speech perception abilities were used to construct auditory ability tests. Correlation and factorial analyses indicated separate capacities for auditory verbal comprehension, auditory immediate memory, temporal tracking, auditory cognition of relationships, discrimination among sound patterns, speech perception…

This article summarizes results from studies of the organization and development of cognitive abilities in adults aged 20 to 60 years old. Theories of intelligence stipulating a hierarchy of intellectual functions, with fluid and crystallized intelligence at the top, are supported. Six conclusions on age differences are offered. (Author/RD)

Responses of 241 convicts on 18 primary mental abilities were factored to explore the idea that there are organizations among visual and auditory functions that operate independently from the relation-perceiving and correlate-educing functions of fluid and crystallized intelligence. The suggested reliable common-factor functions are discussed.…