Pre-stimulus EEG oscillations correlate with perceptual alternation of speech forms
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Speech perception is often seen as a passive process guided by physical stimulus properties. However, ongoing brain dynamics could influence the subsequent perceptual organization of the speech, to an as yet unknown extent. To elucidate this issue, we analyzed EEG oscillatory activity before and immediately after the repetitive auditory presentation of words inducing the so-called verbal transformation effect (VTE), or spontaneous alternation of meanings due to its rapid repetition. Subjects indicated whether the meaning of the bistable word changed or not. For the Reversal more than for the Stable condition, results show a pre-stimulus local alpha desynchronization (300-50 ms), followed by an early post-stimulus increase of local beta synchrony (0-80 ms), and then a late increase and decrease of local alpha (200-340 ms) and beta (360-440 ms) synchrony respectively. Additionally, the ERPs showed that reversal positivity (RP) and reversal negativity components (RN), along with a late positivity complex (LPC) correlate with switching between verbal forms. Our results show how the ongoing dynamics brain is actively involved in the perceptual organization of the speech, destabilizing verbal perceptual states, and facilitating the perceptual regrouping of the elements composing the linguistic auditory stimulus.
CONICYT under Grant FONDECYT 1120752 Associative Research Program of CONICYT under Grant Basal Funds for Centers of Excellence FB 0003 program CONICYT PAI/Academia 79130005 Initial Teacher Training of MECESUP3 UCH1201
Artículo de publicación ISI
Quote ItemNeuroscience Letters 622 (2016) 24–29
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