Abstract

Plots of discharge rate vs frequency at a number of intensities were determined for 163 neurons. Presumably the bandwidth of these response areas is determined by the shape of the traveling wave envelope on the basilar membrane. According to Greenwood, the distance from the peak to the apical foot of the wave is approximately constant [D. D. Greenwood, J. Acoust. Soc. Am. 34, 1364–1369 (1962)]. Using his frequency-distance function for the cat, we have calculated for each response area the distance along the basilar membrane between the locations for the best frequency and the upper cutoff frequency. When this “critical distance” (c.d.) is plotted versus best frequency for all units, c.d. tends to increase as best frequency declines below about 2 kHz. In order to obtain relatively constant c.d. throughout the entire frequency range, it is necessary to revise Greenwood's function such that the distances for the lower octaves deviate even more from a logarithmic representation than suggested by his original curve. [Supported by NIH grants NS 06225 ,and NS 12732.]

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