Previous work with cards left the joint effects of varying entropy and discriminability on choice-reaction times somewhat in doubt. A card-sorting situation is here constructed in which entropy and discriminability can be varied independently. Two experiments are described with naive subjects and two different treatments of the practice effect. The effect of varying entropy with discriminability held constant is. shown to be significantly non-linear, contrary to the prediction from information theory. Finally a statistical model is proposed which shows at least, qualitative agreement with the results of these experiments.
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