Cattell's and Calkins's use of reaction time and of psychophysical measurements proved to be a useful set of techniques for the measurement of intelligence.

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Cattell's and Calkins's use of reaction time and psychophysical measurements were initially thought to be promising for measuring intelligence, but they ultimately proved to be less useful than hoped. These methods did not correlate well with more complex cognitive tasks and academic performance, leading to the development of other approaches to intelligence assessment.

Cattell's and Calkins's Use of Reaction Time and of Psychophysical