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| The Wisconsin Card Sorting Test (WCST) is a neuropsychological
test of "set-shifting", i.e. the ability to display flexibility
in the face of changing schedules of reinforcement. Initially, a
number of stimulus cards are presented to the participant. The
participant is not told how to match the cards; however, he or
she is told whether a particular match is right or wrong. The
mistakes made during this learning process, are analyzed to
arrive at a score. The original WCST used paper cards and was
carried out with the experimenter on one side of the desk facing
the participant on the other. Since the early 1990s, however,
computerized versions of the task have been available, the most
recent version being the Microsoft Windows-compatible version
4.0. The latter has the advantage of automatically scoring the
test, which was quite complex in the manual version. The test
takes approximatel