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  Spatial representations of temporal and spectral sound cues in human auditory cortex

Herdener, M., Eposito, F., Scheffler, K., Logothetis, N. K., Uludag, K., & Kayser, C. (2013). Spatial representations of temporal and spectral sound cues in human auditory cortex. Cortex, 49(10), 2822-2833. doi:10.1016/j.cortex.2013.04.003.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1247-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-3C32-4
Genre: Journal Article

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Herdener, M1, 2, Author              
Eposito, F, Author
Scheffler, Klaus1, 2, Author              
Logothetis, Nikos K2, 3, Author              
Uludag, K, Author              
Kayser, C2, 4, Author              
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
4Research Group Physiology of Sensory Integration, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497808              

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 Abstract: Natural and behaviorally relevant sounds are characterized by temporal modulations of their waveforms, which carry important cues for sound segmentation and communication. Still, there is little consensus as to how this temporal information is represented in auditory cortex. Here, by using functional magnetic resonance imaging (fMRI) optimized for studying the auditory system, we report the existence of a topographically ordered spatial representation of temporal sound modulation rates in human auditory cortex. We found a topographically organized sensitivity within auditory cortex to sounds with varying modulation rates, with enhanced responses to lower modulation rates (2 and 4 Hz) on lateral parts of Heschl's gyrus (HG) and faster modulation rates (16 and 32 Hz) on medial HG. The representation of temporal modulation rates was distinct from the representation of sound frequencies (tonotopy) that was orientated roughly orthogonal. Moreover, the combination of probabilistic anatomical maps with a previously proposed functional delineation of auditory fields revealed that the distinct maps of temporal and spectral sound features both prevail within two presumed primary auditory fields hA1 and hR. Our results reveal a topographically ordered representation of temporal sound cues in human primary auditory cortex that is complementary to maps of spectral cues. They thereby enhance our understanding of the functional parcellation and organization of auditory cortical processing.

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 Dates: 2013-12
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.cortex.2013.04.003
BibTex Citekey: HerdenerESSLUK2013
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Title: Cortex
Source Genre: Journal
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Pages: - Volume / Issue: 49 (10) Sequence Number: - Start / End Page: 2822 - 2833 Identifier: -