COGNITO - Inserm
COGNITO - Inserm
COGNITO - Inserm
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1. REACTION TIME The test measures simple reaction time using the dominant hand. When a<br />
stimulus (a clown) appears on the screen, the subject must press the space<br />
bar. The time recorded appears on the screen.<br />
After reading the instructions to<br />
the subject press the Start button<br />
to begin the 5 Practice trials.<br />
The subject should have his finger<br />
just above the space bar in<br />
preparation for each stimulus. The<br />
practice trial may be repeated as<br />
often as necessary if the subject<br />
has difficulty in understanding the<br />
instructions or begins to touch the<br />
bar before the stimulus has<br />
appeared.<br />
Trials are given with random inter-trial intervals.<br />
The reaction time is recorded to one hundredth of a second. A correct<br />
response will be between 100 and 500 milliseconds.<br />
If the subject responds before 100 milliseconds it is counted as an<br />
Anticipation error. If the subject responds between 500 and 2000<br />
milliseconds it is considered a time Lapse problem (an very slow response -<br />
subject has probably been distracted from a correct response leading to a<br />
possible outlier score). If the subject does not respond at all after 2 seconds it<br />
is considered a failure (Over Time error).<br />
The test is terminated when the subject has recorded 12 valid responses. A<br />
maximum of 36 trials may be given.<br />
The interviewer should only start<br />
the real test when the instructions<br />
are understood<br />
In the Results file the following are recorded:<br />
- Validity of response for each trial<br />
- The mean of the 12 valid responses<br />
- Total number of trials by the subject<br />
- The number of Anticipation errors<br />
- The number of time Lapses<br />
- The number of Over Time errors<br />
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