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Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth
Using modulation transfer functions (MTF), we investigated how sound patterns are processed within the auditory pathway of grasshoppers. Spike rates of auditory receptors and primary-like local neurons did not depend on modulation frequencies while other local and ascending neurons had lowpass, band...
Autores principales: | , , |
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Formato: | Texto |
Lenguaje: | English |
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Springer-Verlag
2010
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016238/ https://www.ncbi.nlm.nih.gov/pubmed/20865417 http://dx.doi.org/10.1007/s00359-010-0587-4 |
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author | Wohlgemuth, Sandra Vogel, Astrid Ronacher, Bernhard |
author_facet | Wohlgemuth, Sandra Vogel, Astrid Ronacher, Bernhard |
author_sort | Wohlgemuth, Sandra |
collection | PubMed |
description | Using modulation transfer functions (MTF), we investigated how sound patterns are processed within the auditory pathway of grasshoppers. Spike rates of auditory receptors and primary-like local neurons did not depend on modulation frequencies while other local and ascending neurons had lowpass, bandpass or bandstop properties. Local neurons exhibited broader dynamic ranges of their rate MTF that extended to higher modulation frequencies than those of most ascending neurons. We found no indication that a filter bank for modulation frequencies may exist in grasshoppers as has been proposed for the auditory system of mammals. The filter properties of half of the neurons changed to an allpass type with a 50% reduction of modulation depths. Contrasting to reports for mammals, the sensitivity to small modulation depths was not enhanced at higher processing stages. In ascending neurons, a focus on the range of low modulation frequencies was visible in the temporal MTFs, which describe the temporal locking of spikes to the signal envelope. To investigate the influence of stimulus rise time, we used rectangularly modulated stimuli instead of sinusoidally modulated ones. Unexpectedly, steep stimulus onsets had only small influence on the shape of MTF curves of 70% of neurons in our sample. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00359-010-0587-4) contains supplementary material, which is available to authorized users. |
format | Text |
id | pubmed-3016238 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2010 |
publisher | Springer-Verlag |
record_format | MEDLINE/PubMed |
spelling | pubmed-30162382011-02-04 Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth Wohlgemuth, Sandra Vogel, Astrid Ronacher, Bernhard J Comp Physiol A Neuroethol Sens Neural Behav Physiol Original Paper Using modulation transfer functions (MTF), we investigated how sound patterns are processed within the auditory pathway of grasshoppers. Spike rates of auditory receptors and primary-like local neurons did not depend on modulation frequencies while other local and ascending neurons had lowpass, bandpass or bandstop properties. Local neurons exhibited broader dynamic ranges of their rate MTF that extended to higher modulation frequencies than those of most ascending neurons. We found no indication that a filter bank for modulation frequencies may exist in grasshoppers as has been proposed for the auditory system of mammals. The filter properties of half of the neurons changed to an allpass type with a 50% reduction of modulation depths. Contrasting to reports for mammals, the sensitivity to small modulation depths was not enhanced at higher processing stages. In ascending neurons, a focus on the range of low modulation frequencies was visible in the temporal MTFs, which describe the temporal locking of spikes to the signal envelope. To investigate the influence of stimulus rise time, we used rectangularly modulated stimuli instead of sinusoidally modulated ones. Unexpectedly, steep stimulus onsets had only small influence on the shape of MTF curves of 70% of neurons in our sample. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00359-010-0587-4) contains supplementary material, which is available to authorized users. Springer-Verlag 2010-09-24 2011 /pmc/articles/PMC3016238/ /pubmed/20865417 http://dx.doi.org/10.1007/s00359-010-0587-4 Text en © The Author(s) 2010 https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. |
spellingShingle | Original Paper Wohlgemuth, Sandra Vogel, Astrid Ronacher, Bernhard Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
title | Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
title_full | Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
title_fullStr | Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
title_full_unstemmed | Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
title_short | Encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
title_sort | encoding of amplitude modulations by auditory neurons of the locust: influence of modulation frequency, rise time, and modulation depth |
topic | Original Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016238/ https://www.ncbi.nlm.nih.gov/pubmed/20865417 http://dx.doi.org/10.1007/s00359-010-0587-4 |
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