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The Odd-Man-Out Reaction Time test is a test of reaction times that uses Arthur Jensen's testing apparatus, the Jensen box. The box is normally used for measuring choice reaction times in which the participant in the experiment is tested on their ability to recognize which of the eight lights of the Jensen box is illuminated, as quickly as possible. However, in the Odd Man Out Reaction Time test, three lights are illuminated in each trial. Two are close together and the other further apart; the individual being tested must identify this third light.
The Odd-Man-Out Reaction Time test correlates with "Intelligent Quotients in the range of 0.30 to 0.60, a reliable and substantial effect." This correlation range is typically higher than the correlations to IQ in other reaction-time tests.