Journal article
Passive exposure of adult cats to bandlimited tone pip ensembles or noise leads to long-term response suppression in auditory cortex
Hearing research, v 277(1-2), pp 117-126
01 Jul 2011
PMID: 21316436
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We have recently demonstrated that persistent, passive exposure of adult cats to bandlimited tone pip ensembles at moderate intensities (similar to 70 dB SPL) leads to a long-term suppression of neural activity in auditory cortex, in the absence of hearing loss. With wideband ensembles (4-20 kHz), the suppression is limited to the exposure frequency range; with narrowband ensembles (2-4 kHz, or third-octave bands centered at 4 and 16 kHz), suppression occurs not only within but also well beyond the exposure range, at least in primary auditory cortex (Al). (In secondary cortex (All) suppression remains limited mostly to the exposure range even for narrowband ensembles.) We report here on two additional experiments. First, we demonstrate suppression in both Al and All upon exposure to 4-20 kHz bandlimited noise, thus generalizing our previous results obtained with tonal ensembles. However, we found a somewhat different suppression pattern with noise. Whereas 4-20 kHz tone exposure produced relatively uniform suppression over the 4-20 kHz range, save for a small local minimum at similar to 10 kHz, 4-20 kHz noise produced maximal suppression over similar to 4-10 kHz, which then progressively weakened with frequency up to 20 kHz. Second, we outline the time course of the emergence of response suppression in Al, using the above-mentioned pair of third-octave bands as the exposure stimulus. Suppression emerged relatively rapidly, within a week of exposure onset, and was initially confined to frequencies close to the 4 and 16 kHz stimulus bands. Over the course of several more weeks, the suppression broadened to cover the entire 4-16 kHz range. We discuss these new findings with reference to the putative mechanisms underlying exposure-induced auditory cortical plasticity. (C) 2011 Elsevier B.V. All rights reserved.
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Details
- Title
- Passive exposure of adult cats to bandlimited tone pip ensembles or noise leads to long-term response suppression in auditory cortex
- Creators
- Martin Pienkowski - University of CalgaryRaymundo Munguia - University of CalgaryJos J. Eggermont - University of Calgary
- Publication Details
- Hearing research, v 277(1-2), pp 117-126
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- Campbell McLaurin Chair for Hearing Deficiencies Alberta Heritage Foundation for Medical Research National Sciences and Engineering Research Council of Canada; Natural Sciences and Engineering Research Council of Canada (NSERC)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Audiology - 4 Year
- Web of Science ID
- WOS:000293726600014
- Scopus ID
- 2-s2.0-79960266531
- Other Identifier
- 991022025116004721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Audiology & Speech-language Pathology
- Neurosciences
- Otorhinolaryngology