Basic determinants for FM responses in the inferior colliculus of rats |
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Authors: | P W F Poon X Chen J C Hwang |
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Institution: | (1) Department of Physiology, Faculty of Medicine, University of Hong Kong, Sassoon Road, Hong Kong;(2) Present address: Dept. of Neurophysiology, Univ. of Wisconsin, 53705 Madison, WI, USA |
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Abstract: | Summary The response of 835 click-sensitive neurons in the inferior colliculus (IC) to ramp frequency modulated (FM) tones was studied in the anaesthetized rat. More than 70% of the cells were sensitive to the FM sound, and over 25% were FM specialized . Systematic variations of the stimulus parameters showed that sweep velocity, sweep range, and intensity of the FM signal were the 3 basic determinants for the unit response. For an FM specialized cell, the response pattern to each of the parameters was either monotonic or bell-shaped. The population statistics of response patterns to the FM parameters, including the tuning factors, were generated. A stimulus domain was proposed to represent the receptive space of the FM cells. |
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Keywords: | Frequency modulation Inferior colliculus Click-sensitive units Receptive space Rat |
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