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Basic determinants for FM responses in the inferior colliculus of rats

✍ Scribed by P. W. F. Poon; X. Chen; J. C. Hwang

Publisher
Springer-Verlag
Year
1991
Tongue
English
Weight
849 KB
Volume
83
Category
Article
ISSN
0014-4819

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✦ Synopsis

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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