Responses of Chinchilla Inferior Colliculus Neurons to Amplitude-Modulated Tones with Different Envelopes
Open Access
- 1 December 2002
- journal article
- Published by Springer Nature in Journal of the Association for Research in Otolaryngology
- Vol. 3 (4) , 390-402
- https://doi.org/10.1007/s101620020026
Abstract
Responses of single neurons in the inferior colliculus of the chinchilla to amplitude-modulated tones were obtained. In one condition, the modulating waveform was a low-frequency sinusoid (SAM tone). In the other, the modulator was a trapezoid with fixed parameters, used to create trains of brief tone bursts presented at various repetition rates (TRAM tone). Modulation frequency (or repetition rate) was varied over the range from 10 to 200 Hz. Many individual neurons exhibited strong selectivity for modulator type. Neurons with pauser discharge patterns to steady-state tones usually exhibited greater responsiveness to SAM tones than to TRAM. In contrast, neurons that responded transiently to steady-state tones usually exhibited greater responsiveness to TRAM tones than to SAM. Neurons with sustained responses to steady-state tones responded strongly to both types of modulated tones. The selectivity for modulator type suggests that transient neurons may play a different functional role in the representation of envelopes than do other types of neurons.Keywords
This publication has 0 references indexed in Scilit: