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A reaction-time test is a type of test designed to measure how quickly an individual responds to a stimulus. The goal is to assess the time it takes for a person to perceive the stimulus and react to it, which reflects their cognitive and physical processing speed.A reaction-time test is a type of test designed to measure how quickly an individual responds to a stimulus. The goal is to assess the time it takes for a person to perceive the stimulus and react to it, which reflects their cognitive and physical processing speed.