Recent studies have reported significant correlations between response time, varying from push-button reaction time to sentence verification time, and intelligence scores. The present study obtained correlations in the opposite direction: faster subjects in a word-judging task had lower Raven's Progressive Matrices scores. A distinction might be made between speed of mental processes and response time. Mental speed is only inferred from response time and assumes knowledge of the processes leading to response. Mental speed could conceivably be correlated with intelligence but response time needs not.
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