Modulation of auditory evoked responses to spectral and temporal changes by behavioral discrimination training |
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Authors: | Rossitza Draganova Andreas Wollbrink Matthias Schulz Hidehiko Okamoto Christo Pantev |
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Institution: | 2. Universit?tsklinikum Tübingen, MEG Zentrum, Otfried-Müller-Str. 47, D-72076, Tübingen, Germany 1. Institute for Biomagnetism and Biosignalanalysis, University of Muenster, Muenster, Germany
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Abstract: | Background Due to auditory experience, musicians have better auditory expertise than non-musicians. An increased neocortical activity
during auditory oddball stimulation was observed in different studies for musicians and for non-musicians after discrimination
training. This suggests a modification of synaptic strength among simultaneously active neurons due to the training. We used
amplitude-modulated tones (AM) presented in an oddball sequence and manipulated their carrier or modulation frequencies. We
investigated non-musicians in order to see if behavioral discrimination training could modify the neocortical activity generated
by change detection of AM tone attributes (carrier or modulation frequency). Cortical evoked responses like N1 and mismatch
negativity (MMN) triggered by sound changes were recorded by a whole head magnetoencephalographic system (MEG). We investigated
(i) how the auditory cortex reacts to pitch difference (in carrier frequency) and changes in temporal features (modulation
frequency) of AM tones and (ii) how discrimination training modulates the neuronal activity reflecting the transient auditory
responses generated in the auditory cortex. |
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Keywords: | |
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