Wisconsin Card Sorting Test - Analysis
In the Wisconsin Card Sorting Test, the subject has to determine the criterion for sorting the cards into four piles. After each sort, feedback is given to subject about whether the pile was correct or not. Once the subject has successfully sorted a number of cards (typically 6-10), the sorting criterion is changed. The test is commonly used as a neuropsychological test of prefrontal lobe function, and can also be used as an example of a high or medium work load in the examination of changes in the biosignals during the mental work.
The analysis module for the Wisconsin Card Sorting Test is an example how the various analysis methods in the software package can be combined. With this highly developed analysis tool it is cur-rently possible to:
- Visualize the progress of the card sorting, i.e. what was the required sorting criterion, on which pile the subject has placed the card, whether it was right or wrong, on which piles the card would have matched and how much time the subject used on sorting each card.
- Examine the heart rate variability (HRV) during the test. The high mental load may cause changes in some time-domain measures of HRV and reduce the power of the higher frequency bands in the power spectrum estimate of HRV
- Trigger the GSR channel to the card-placing events. It can be assumed that after a long period of successful sorting, a wrong answer due to a change of sorting criterion will evoke galvanic skin response.