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The aim of this study was to determine whether auditory perceptual learning is associated with changes in the frequency organization and/or neuronal response properties of primary auditory cortex (AI). Five out of six cats trained on an 8 kHz frequency discrimination task showed improvements in performance that reflected changes in discriminative capacity. Quantitative measures of the response characteristics and frequency organization of AI revealed that the frequency organization of AI in trained cats did not differ from that in controls, but there was a tendency for neurons with a CF immediately above 8 kHz to have slightly broader tuning in the trained cats than in controls, and neurons in one of these bands had significantly shorter latency. These results are in accord with recent reports that cortical topography in primary visual cortex is unchanged in animals trained on visual discrimination tasks, but are at variance with an earlier report of enlarged representations of training frequencies in AI of monkeys trained on a frequency discrimination task. It is concluded that substantial changes in perceptual discriminative capacity can occur without change in primary cortical topography and with only small changes in neuronal response characteristics.

Perceptual Learning on an Auditory Frequency Discrimination Task by Cats: Association with Changes in Primary Auditory Cortex