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Mapping the brain's orchestration during speech comprehension : task-specific facilitation of regional synchrony in neural networks

Mapping the brain's orchestration during speech comprehension : task-specific facilitation of regional synchrony in neural networks

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HAERLE, Markus, Brigitte ROCKSTROH, Andreas KEIL, Christian WIENBRUCH, Thomas ELBERT, 2004. Mapping the brain's orchestration during speech comprehension : task-specific facilitation of regional synchrony in neural networks. In: BMC Neuroscience. 5(40). Available under: doi: 10.1186/1471-2202-5-40

@article{Haerle2004Mappi-10070, title={Mapping the brain's orchestration during speech comprehension : task-specific facilitation of regional synchrony in neural networks}, year={2004}, doi={10.1186/1471-2202-5-40}, number={40}, volume={5}, journal={BMC Neuroscience}, author={Haerle, Markus and Rockstroh, Brigitte and Keil, Andreas and Wienbruch, Christian and Elbert, Thomas} }

2011-03-25T09:13:50Z Haerle, Markus Keil, Andreas Keil, Andreas 2004 Elbert, Thomas deposit-license First publ. in: BMC Neuroscience 2004, 5:40 Haerle, Markus Background: How does the brain convert sounds and phonemes into comprehensible speech? In the present magnetoencephalographic study we examined the hypothesis that the coherence of electromagnetic oscillatory activity within and across brain areas indicates neurophysiological processes linked to speech comprehension.<br />Results: Amplitude-modulated (sinusoidal 41.5 Hz) auditory verbal and nonverbal stimuli served to drive steady-state oscillations in neural networks involved in speech comprehension. Stimuli were presented to 12 subjects in the following conditions (a) an incomprehensible string of words, (b) the same string of words after being introduced as a comprehensible sentence by proper articulation, and (c) nonverbal stimulations that induced a 600-Hz tone, a scale, and a melody. Coherence, defined as correlated activation of magnetic steady state fields across brain areas and measured as simultaneous activation of current dipoles in source space (Minimum-Norm-Estimates), increased within left-temporal-posterior areas when the sound string was perceived as a comprehensible sentence. Intra-hemispheric coherence was larger within the left than the right within the right than the left hemisphere for the sentence (condition (b) relative to all other conditions), and tended to be larger within the right than the left hemisphere for nonverbal stimuli (condition (c), tone and melody relative to the other conditions), leading to a more pronounced hemispheric asymmetry for nonverbal than verbal material.<br />Conclusions: We conclude that coherent neuronal network activity may index encoding of verbal information on the sentence level and can be used as a tool to investigate auditory speech comprehension. Elbert, Thomas application/pdf Wienbruch, Christian eng Wienbruch, Christian Rockstroh, Brigitte Rockstroh, Brigitte 2011-03-25T09:13:50Z Mapping the brain's orchestration during speech comprehension : task-specific facilitation of regional synchrony in neural networks

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