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| Intellectual Development | 1 |
| Intelligence | 1 |
| Intelligence Differences | 1 |
| Intelligence Tests | 1 |
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| Mental Retardation | 1 |
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| Intelligence | 1 |
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| Spitz, Herman H. | 1 |
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Peer reviewedSpitz, Herman H. – Intelligence, 1981
Persons representing the extremes of intelligence cannot be included in the same study unless they are approximately equated on mental age, in which case the relative performances of the extreme groups can provide useful information about the nature of intelligence. (Author/RD)
Descriptors: Intellectual Development, Intelligence, Intelligence Differences, Intelligence Tests
