Reduced alpha amplitudes predict perceptual suppression

Abstract The amplitude of prestimulus alpha oscillations over parieto-occipital cortex has been shown to predict visual detection of masked and threshold-level stimuli. Whether alpha activity similarly predicts target visibility in perceptual suppression paradigms, another type of illusion commonly...

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Autores principales:	Eva Poland, Aishwarya Bhonsle, Iris Steinmann, Melanie Wilke
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/90932098c38b4b9c8109b376c72a9179
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spelling	oai:doaj.org-article:90932098c38b4b9c8109b376c72a91792021-12-02T18:02:49ZReduced alpha amplitudes predict perceptual suppression10.1038/s41598-021-92404-82045-2322https://doaj.org/article/90932098c38b4b9c8109b376c72a91792021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92404-8https://doaj.org/toc/2045-2322Abstract The amplitude of prestimulus alpha oscillations over parieto-occipital cortex has been shown to predict visual detection of masked and threshold-level stimuli. Whether alpha activity similarly predicts target visibility in perceptual suppression paradigms, another type of illusion commonly used to investigate visual awareness, is presently unclear. Here, we examined prestimulus alpha activity in the electroencephalogram (EEG) of healthy participants in the context of a generalized flash suppression (GFS) task during which salient target stimuli are rendered subjectively invisible in a subset of trials following the onset of a full-field motion stimulus. Unlike for masking or threshold paradigms, alpha (8–12 Hz) amplitude prior to motion onset was significantly higher when targets remained subjectively visible compared to trials during which the targets became perceptually suppressed. Furthermore, individual prestimulus alpha amplitudes strongly correlated with the individual trial-to-trial variability quenching following motion stimulus onset, indicating that variability quenching in visual cortex is closely linked to prestimulus alpha activity. We conclude that predictive correlates of conscious perception derived from perceptual suppression paradigms differ substantially from those obtained with “near threshold paradigms”, possibly reflecting the effectiveness of the suppressor stimulus.Eva PolandAishwarya BhonsleIris SteinmannMelanie WilkeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Eva Poland Aishwarya Bhonsle Iris Steinmann Melanie Wilke Reduced alpha amplitudes predict perceptual suppression
description	Abstract The amplitude of prestimulus alpha oscillations over parieto-occipital cortex has been shown to predict visual detection of masked and threshold-level stimuli. Whether alpha activity similarly predicts target visibility in perceptual suppression paradigms, another type of illusion commonly used to investigate visual awareness, is presently unclear. Here, we examined prestimulus alpha activity in the electroencephalogram (EEG) of healthy participants in the context of a generalized flash suppression (GFS) task during which salient target stimuli are rendered subjectively invisible in a subset of trials following the onset of a full-field motion stimulus. Unlike for masking or threshold paradigms, alpha (8–12 Hz) amplitude prior to motion onset was significantly higher when targets remained subjectively visible compared to trials during which the targets became perceptually suppressed. Furthermore, individual prestimulus alpha amplitudes strongly correlated with the individual trial-to-trial variability quenching following motion stimulus onset, indicating that variability quenching in visual cortex is closely linked to prestimulus alpha activity. We conclude that predictive correlates of conscious perception derived from perceptual suppression paradigms differ substantially from those obtained with “near threshold paradigms”, possibly reflecting the effectiveness of the suppressor stimulus.
format	article
author	Eva Poland Aishwarya Bhonsle Iris Steinmann Melanie Wilke
author_facet	Eva Poland Aishwarya Bhonsle Iris Steinmann Melanie Wilke
author_sort	Eva Poland
title	Reduced alpha amplitudes predict perceptual suppression
title_short	Reduced alpha amplitudes predict perceptual suppression
title_full	Reduced alpha amplitudes predict perceptual suppression
title_fullStr	Reduced alpha amplitudes predict perceptual suppression
title_full_unstemmed	Reduced alpha amplitudes predict perceptual suppression
title_sort	reduced alpha amplitudes predict perceptual suppression
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/90932098c38b4b9c8109b376c72a9179
work_keys_str_mv	AT evapoland reducedalphaamplitudespredictperceptualsuppression AT aishwaryabhonsle reducedalphaamplitudespredictperceptualsuppression AT irissteinmann reducedalphaamplitudespredictperceptualsuppression AT melaniewilke reducedalphaamplitudespredictperceptualsuppression
_version_	1718378880906035200

Reduced alpha amplitudes predict perceptual suppression

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