| Choice Reaction Time (CRT) is a 2-choice reaction time test which is similar to the Simple Reaction Time (SRT) test, except that stimulus and response uncertainty are introduced by having two possible stimuli and two possible responses. It is useful for testing general alertness and motor speed. |
Administration time
Around 7 minutes, depending on level of impairment.
Task
An arrow-shaped stimulus is displayed on either the left or the right side of the screen.
The subject must press the left hand button on the press pad if the stimulus is displayed on the left hand side of the screen, and the right hand button on the press pad if the stimulus is displayed on the right hand side of the screen.
Test modes
Clinical mode.
Outcome measures
This test has thirteen outcome measures, assessing correct and incorrect responses, errors of commission and omission (late and early responses), and latency (response speed).
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