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One set of sounds, two tonotopic maps : exploring auditory cortex with amplitude-modulated tones

One set of sounds, two tonotopic maps : exploring auditory cortex with amplitude-modulated tones

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WEISZ, Nathan, Andreas KEIL, Christian WIENBRUCH, S. HOFFMEISTER, Thomas ELBERT, 2004. One set of sounds, two tonotopic maps : exploring auditory cortex with amplitude-modulated tones. In: Clinical Neurophysiology. 115, pp. 1249-1258

@article{Weisz2004sound-10548, title={One set of sounds, two tonotopic maps : exploring auditory cortex with amplitude-modulated tones}, year={2004}, doi={10.1016/j.clinph.2003.12.034}, volume={115}, journal={Clinical Neurophysiology}, pages={1249--1258}, author={Weisz, Nathan and Keil, Andreas and Wienbruch, Christian and Hoffmeister, S. and Elbert, Thomas} }

Weisz, Nathan Weisz, Nathan Elbert, Thomas 2004 deposit-license Elbert, Thomas Hoffmeister, S. One set of sounds, two tonotopic maps : exploring auditory cortex with amplitude-modulated tones Wienbruch, Christian 2011-03-25T09:19:09Z Objective: The possibility of simultaneously observing activation of primary and secondary auditory cortices has been demonstrated by<br />Engelien et al. [Hear Res 2000;148:153 60].<br />Methods: Such a dual monitoring by means of neuromagnetic recordings can be achieved when a subject is stimulated by brief pulses of<br />40 Hz-modulated tones. Depending on the frequency filter applied, either the steady-state field (SSF) or the N1m can be extracted from the<br />evoked magnetic field complex.<br />Results: Using this combined (two-maps) paradigm with 4 carrier frequencies, we show that it is possible to synchronously screen two<br />tonotopic maps one map each reflected either by the SSF or the N1m. Indicators are the systematic variation in the location (higher<br />frequencies are more posterior) and orientation (higher frequencies oriented differently in the saggital plane) of the equivalent current dipole<br />(ECD). These parameters were compared with those obtained from classic (one map) paradigms in which either a pure tone elicits an N1m<br />or a 40 Hz continuous (3 s) stimulation produces an SSF. Overall the results were similar, however, systematic differences between the<br />paradigms were found for ECD localization, dipole strength, amplitude, and phase.<br />Conclusions and Significance: One possible interpretation of these results is that different tonotopically arranged cortical fields were<br />involved in the generation of the components. Keil, Andreas Wienbruch, Christian eng application/pdf Zuerst erschienen in: Clinical Neurophysiology 115 (2004) 1249 1258 2011-03-25T09:19:09Z Hoffmeister, S. Keil, Andreas

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