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- Introduction
Administration Time (in healthy volunteers): 2 Minutes
Cognitive Domain Usually Measured: Visual Attention / Vigilance
Task Description:
The pre-task on-screen instructions ask: "Is the card red?" The test supervisor will read full instructions to the subject from the test supervisor script.
To begin the task, the test supervisor or subject must press the "Enter" key. A playing card is presented in the center of the screen.
The card will flip over so it is face up. As soon as it does this the subject must decide whether the card is red or not.
If it is red they should press "Yes", if it is not red they should press "No".
The subject will practice until they reach the required number of responses, or until the practice period expires.
Then, on screen instructions for the real test are presented. The test supervisor or subject must press the "Enter" key to begin the real test.
The subject should be encouraged to work as quickly as they can and be as accurate as they can. For example, the subject should try not to press either the "Yes" or "No" key before a card flips over. If they make a mistake they will hear an error sound.
Primary Outcome measures:
Unit of measurement: Log10 milliseconds
Description and interpretation of scores: Speed of performance; mean of the log10 transformed reaction times for correct responses. (Lower score = better performance)
