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Sustained Attention to Response Task (SART)
In this short task, the computer presents single digits at a rate of just over one per second, and volunteers are told to press a button to every number, except if that number is 3. This number only occurs on around 11% of presentations, and the trick is to keep your mind on this repetitive and apparently easy task well enough to stop yourself pressing the 3 when it appears.
Touch every number that you see as fast as you can but try not to touch the number '3'.
