Sensitivity of cat primary auditory cortex (Al) neurons to the direction and rate of frequency modulation |
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Authors: | J.R. Mendelson M.S. Cynader |
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Abstract: | Responses of 65 single auditory cortex (AI) neurons to frequency-modulated (FM) sweeps with different rates and direction of frequency change were examined quantitatively. Most units responded differentially depending on the characteristics of the FM sweep stimulus. Sixty-five percent of the units encountered responded at least twice as well for one direction of the FM sweep as for the other direction. Of these direction selective neurons, 67% preferred downward-directed FM sweeps (i.e. changing from high to low frequencies) while only 33% preferred upward-directed FM sweeps. The preference for downward-directed FM sweeps was especially clear in EI cells. In addition, cortical neurons often displayed sensitivity to the rate of frequency modulation (speed sensitivity). |
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Keywords: | auditory cortex FM sweep direction selectivity speed selectivity |
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