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Attentional influences on functional mapping of speech sounds in human auditory cortex

Attentional influences on functional mapping of speech sounds in human auditory cortex

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Prüfsumme: MD5:10b462e572b0e04fb12939f562672960

OBLESER, Jonas, Thomas ELBERT, Carsten EULITZ, 2004. Attentional influences on functional mapping of speech sounds in human auditory cortex. In: BMC Neuroscience. 5(24)

@article{Obleser2004Atten-10325, title={Attentional influences on functional mapping of speech sounds in human auditory cortex}, year={2004}, doi={10.1186/1471-2202-5-24}, number={24}, volume={5}, journal={BMC Neuroscience}, author={Obleser, Jonas and Elbert, Thomas and Eulitz, Carsten} }

deposit-license eng Attentional influences on functional mapping of speech sounds in human auditory cortex 2004 Obleser, Jonas Eulitz, Carsten First publ. in: BMC Neuroscience 2004, 5:24 2011-03-25T09:16:02Z 2011-03-25T09:16:02Z application/pdf Elbert, Thomas Background: The speech signal contains both information about phonological features such as place of articulation and non-phonological features such as speaker identity. These are different aspects of the "what"-processing stream (speaker vs. speech content), and here we show that they can be further segregated as they may occur in parallel but within different neural substrates. Subjects listened to two different vowels, each spoken by two different speakers. During one block, they were asked to identify a given vowel irrespectively of the speaker (phonological categorization), while during the other block the speaker hat to be identified irrespectively of the vowel (speaker categorization). Auditory evoked fields were recorded using 148-channel magnetoencephalography (MEG), and magnetic source imaging was obtained for 17 subjects.<br />Results: During phonological categorization, a vowel-dependent difference of N100m source location perpendicular to the main tonotopic gradient repliated previous findings. In speaker categorization, the realtive mapping of vowels remained unchanged but sources were shifted towards more posterior and more superior locations.<br />Conclusions:<br />These results imply that the N100m reflects the extraction of abstract invariants from the speech signal. This part of the processing is accomplished in auditory areas anterior to Al, which are part of the auditory 'what' system. This network seems to include spatially separable modules for identifying the phonological information and for associating it with a particular speaker that are activated in synchrony but within different regions, suggesting that the 'what' processing can be more adequately modeled by a stream of parallel stages. The relative activation of the parallel processing stages can be modulated by attentional or task demands. Eulitz, Carsten Obleser, Jonas Elbert, Thomas

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

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