Transient and phase-locked evoked magnetic fields in response to periodic acoustic signals

Neuroreport
Ingo HertrichHermann Ackermann

Abstract

Using whole-head MEG, time course and hemispheric lateralization effects of phase-locked brain responses to complex periodic acoustic signals (stimulus frequency 13, 22, 40, 67, or 111 Hz) were determined based on a dipole analysis approach. Apart from systematic rate-induced changes in amplitude and shape of the transient evoked magnetic fields (M50, M100), phase-locked brain activity emerged, being more pronounced over the right as compared to the left hemisphere. Furthermore, this MEG component showed a consistent phase angle across subjects, indicating active synchronization mechanisms within auditory cortex that operate upon afferent input. Conceivably, these early side-differences in periodicity encoding contribute to or even snowball into hemispheric lateralization effects of higher-order aspects of central-auditory processing such as melody perception.

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Citations

Jun 15, 2007·Cerebral Cortex·Tony W WilsonDonald C Rojas
Nov 13, 2004·Neuroreport·Maria ChaitDavid Poeppel
May 12, 2009·Biological Psychology·Fu-Jung HsiaoYung-Yang Lin
Oct 28, 2006·Neuropsychologia·Ingo HertrichHermann Ackermann
Jul 6, 2016·Frontiers in Aging Neuroscience·Tine GoossensAstrid van Wieringen
Oct 13, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Alexander B NeimanPeter A Tass
Aug 25, 2020·NeuroImage·Joshua P KulasinghamJonathan Z Simon

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