Auditory Discrimination of Amplitude Modulations Based on Metric Distances of Spike Trains
Department of Biology, Humboldt University, Berlin, Germany Submitted 24 November 2006; accepted in final form 13 February 2007 Sound envelope cues play a crucial role for the recognition and discrimination of communication signals in diverse taxa, such as vertebrates and arthropods. Using a classif...
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Veröffentlicht in: | Journal of neurophysiology 2007-04, Vol.97 (4), p.3082-3092 |
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Sprache: | eng |
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Zusammenfassung: | Department of Biology, Humboldt University, Berlin, Germany
Submitted 24 November 2006;
accepted in final form 13 February 2007
Sound envelope cues play a crucial role for the recognition and discrimination of communication signals in diverse taxa, such as vertebrates and arthropods. Using a classification based on metric similarities of spike trains we investigate how well amplitude modulations (AMs) of sound signals can be distinguished at three levels of the locust's auditory pathway: receptors and local and ascending neurons. The spike train metric has the advantage of providing information about the necessary evaluation time window and about the optimal temporal resolution of processing, thereby yielding clues to possible coding principles. It further allows one to disentangle the respective contributions of spike count and spike timing to the fidelity of discrimination. These results are compared with the traditional paradigm using modulation transfer functions. Spike trains of receptors and two primary-like local interneurons enable an excellent discrimination of different AM frequencies, up to about 150 Hz. In these neurons discriminability depends almost completely on the timing of spikes, which must be evaluated with a temporal resolution of |
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ISSN: | 0022-3077 1522-1598 |
DOI: | 10.1152/jn.01235.2006 |