Abstract：
:In natural environments, temporally complex signals often occur in a background of noise. The neural mechanisms underlying the preservation of temporal sensitivity in background noise are poorly understood. In the present study, we examined the ability of inferior colliculus (IC) units with primary-like and sustained response patterns ('tonic units') to encode silent gaps in quiet and in background noise. Minimum gap thresholds (MGTs), the shortest silent gap in a noise burst evoking a neural response, were measured in quiet and background noise for 34 IC units. Units were classified as background noise resistant (BNR; MGT did not change in background noise) or background noise sensitive (BNS; MGTs became elevated in background noise). In quiet, the MGTs of BNR and BNS units were comparable and both types of units encoded the gap by a cessation of activity during the gap. The addition of background noise had little effect on the response rate of BNR units either during or after the gap stimulus. In contrast, for BNS units, background noise reduced the response rate during the gap stimulus while increasing the response rate after the gap stimulus. Background noise also altered the first spike latency of BNS units. For BNS units, the mean first spike latency was no longer inversely related to BF, but this relationship was maintained in BNR units. These results suggest that the response of BNS units to background noise obliterates their response to the gap stimulus.
journal_name
Hear Resjournal_title
Hearing researchauthors
Barsz K,Wilson WW,Walton JPdoi
10.1016/s0378-5955(00)00186-6keywords:
subject
Has Abstractpub_date
2000-12-01 00:00:00pages
149-60issue
1-2eissn
0378-5955issn
1878-5891pii
S0378-5955(00)00186-6journal_volume
150pub_type
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