Wundt's first research assistant was James McKeen Cattell,whose best-known contribution to I/O psychology was the concept of mental testing, which influenced the job application process as we know it today.

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This statement is true. James McKeen Cattell was Wundt's first research assistant and he did introduce the concept of mental testing, which had a significant impact on the development of modern I/O psychology and the use of intelligence testing in job selection.

Wundt's First Research Assistant Was James McKeen Cattell,whose Best-Known Contribution