Abstract
Twenty-four cats were trained with stimuli that presented uncorrelated differences in size and brightness, on discrimination and extradimensional shift (EDS) problems in a Grice box. The cue relevant in EDS training was present and irrelevant in initial discrimination training, and the cue relevant in discrimination training was present and irrelevant in EDS training. Cats overtrained for 144 trials in discrimination training learned the EDS as quickly as animals switched to EDS without overtraining. This result is hard to reconcile with Sutherland and Mackintosh’ s attention theory of discrimination learning by animals.
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