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- Introduction
Administration Time (in healthy volunteers): 2 Minutes
Cognitive Domain Usually Measured: Attention
Task Description:
The pre-task on-screen instructions ask, "Has a card touched a white line?" The test supervisor will read the task instructions from the script.
In this task, playing cards are presented next to one another in the middle of the screen. Two horizontal white lines are shown on the screen above and below the cards. The subject must watch all of the cards and press "Yes" as soon as any one of the cards touches either one of the white lines. To begin, the test supervisor presses the "ENTER" key.
The five cards will then start to move randomly, up or down towards the lines. Different cards will touch the upper and lower white lines at different times. As soon as any one of the cards touches one of the lines, the subject must press the "Yes" key. The card that was touching the line then moves back into the middle of the screen and starts to move again. Subject must try to ‘monitor' all the cards at all times, because the other cards don't stop moving when the subject detects a touch.
The subject should be encouraged to work as quickly as they can and be as accurate as they can. For example they should try not to press the "Yes" key when no cards are touching a line. 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)
