Basic determinants for FM responses in the inferior colliculus of rats.
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.
Poon
P W
PW
Department of Physiology, Faculty of Medicine, University of Hong Kong.
Chen
X
X
Hwang
J C
JC
D000161:Acoustic Stimulation; D000818:Animals; D007245:Inferior Colliculi / Q000502:physiology*; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology; D051381:Rats; D011919:Rats, Inbred Strains; D013016:Sound