Neural adaptation to tone sequences in the songbird forebrain: patterns, determinants, and relation to the build-up of auditory streaming |
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Authors: | Mark A Bee Christophe Micheyl Andrew J Oxenham Georg M Klump |
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Institution: | 1. Department of Ecology, Evolution, and Behavior, University of Minnesota, 100 Ecology, 1987 Upper Buford Circle, St. Paul, MN, 55108, USA 2. Department of Psychology, University of Minnesota, N218 Elliott Hall, 75 East River Road, Minneapolis, MN, 55455, USA 3. AG Zoophysiologie und Verhalten, Fakult?t V, Institut für Biologie und Umweltwissenschaften, Carl von Ossietzky Universit?t Oldenburg, 26111, Oldenburg, Germany
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Abstract: | Neural responses to tones in the mammalian primary auditory cortex (A1) exhibit adaptation over the course of several seconds.
Important questions remain about the taxonomic distribution of multi-second adaptation and its possible roles in hearing.
It has been hypothesized that neural adaptation could explain the gradual “build-up” of auditory stream segregation. We investigated
the influence of several stimulus-related factors on neural adaptation in the avian homologue of mammalian A1 (field L2) in
starlings (Sturnus vulgaris). We presented awake birds with sequences of repeated triplets of two interleaved tones (ABA–ABA–…) in which we varied the
frequency separation between the A and B tones (ΔF), the stimulus onset asynchrony (time from tone onset to onset within a triplet), and tone duration. We found that stimulus
onset asynchrony generally had larger effects on adaptation compared with ΔF and tone duration over the parameter range tested. Using a simple model, we show how time-dependent changes in neural responses
can be transformed into neurometric functions that make testable predictions about the dependence of the build-up of stream
segregation on various spectral and temporal stimulus properties. |
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