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| Adult Development | 1 |
| Adults | 1 |
| Age Differences | 1 |
| Cognitive Processes | 1 |
| Cross Sectional Studies | 1 |
| Factor Structure | 1 |
| Intelligence | 1 |
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| Theories | 1 |
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| Intelligence | 1 |
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| Horn, John L. | 1 |
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| Journal Articles | 1 |
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Peer reviewedHorn, John L. – Intelligence, 1980
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)
Descriptors: Adult Development, Adults, Age Differences, Cognitive Processes
