Cargando…

Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation

The visual impulse-response function to random input as measured by EEG is dominated by the perceptual echo, a reverberation of stimulus information in the alpha range believed to represent active rhythmic sampling. How this response is generated on a cortical level is unknown. To characterize the u...

Descripción completa

Detalles Bibliográficos
Autores principales: Schwenk, Jakob C B, VanRullen, Rufin, Bremmer, Frank
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8152942/
https://www.ncbi.nlm.nih.gov/pubmed/34296091
http://dx.doi.org/10.1093/texcom/tgaa012
_version_ 1783698693865603072
author Schwenk, Jakob C B
VanRullen, Rufin
Bremmer, Frank
author_facet Schwenk, Jakob C B
VanRullen, Rufin
Bremmer, Frank
author_sort Schwenk, Jakob C B
collection PubMed
description The visual impulse-response function to random input as measured by EEG is dominated by the perceptual echo, a reverberation of stimulus information in the alpha range believed to represent active rhythmic sampling. How this response is generated on a cortical level is unknown. To characterize the underlying mechanisms, we investigated the echoes’ dynamics following short-term visual deprivation, which is known to modify the excitation/inhibition balance in visual cortex. We subjected observers to 150 min of light deprivation (LD) and monocular contrast deprivation (MD). Perceptual echoes were measured by binocular and dichoptic stimulation, respectively, and compared with a baseline condition. Our results show that the echo response is enhanced after LD, but not affected in temporal frequency or spatial propagation. Consistent with previous studies, MD shifted early response (0–150 ms) amplitudes in favor of the deprived eye, but had no systematic effect on the echoes. Our findings demonstrate that the echoes’ synchrony scales with cortical excitability, adding to previous evidence that they represent active visual processing. Their insensitivity to modulation at the monocular level suggests they are generated by a larger region of visual cortex. Our study provides further insight into how mechanisms of rhythmic sampling are implemented in the visual system.
format Online
Article
Text
id pubmed-8152942
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-81529422021-07-21 Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation Schwenk, Jakob C B VanRullen, Rufin Bremmer, Frank Cereb Cortex Commun Original Article The visual impulse-response function to random input as measured by EEG is dominated by the perceptual echo, a reverberation of stimulus information in the alpha range believed to represent active rhythmic sampling. How this response is generated on a cortical level is unknown. To characterize the underlying mechanisms, we investigated the echoes’ dynamics following short-term visual deprivation, which is known to modify the excitation/inhibition balance in visual cortex. We subjected observers to 150 min of light deprivation (LD) and monocular contrast deprivation (MD). Perceptual echoes were measured by binocular and dichoptic stimulation, respectively, and compared with a baseline condition. Our results show that the echo response is enhanced after LD, but not affected in temporal frequency or spatial propagation. Consistent with previous studies, MD shifted early response (0–150 ms) amplitudes in favor of the deprived eye, but had no systematic effect on the echoes. Our findings demonstrate that the echoes’ synchrony scales with cortical excitability, adding to previous evidence that they represent active visual processing. Their insensitivity to modulation at the monocular level suggests they are generated by a larger region of visual cortex. Our study provides further insight into how mechanisms of rhythmic sampling are implemented in the visual system. Oxford University Press 2020-04-13 /pmc/articles/PMC8152942/ /pubmed/34296091 http://dx.doi.org/10.1093/texcom/tgaa012 Text en © The Author(s) 2020. Published by Oxford University Press. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Schwenk, Jakob C B
VanRullen, Rufin
Bremmer, Frank
Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation
title Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation
title_full Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation
title_fullStr Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation
title_full_unstemmed Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation
title_short Dynamics of Visual Perceptual Echoes Following Short-Term Visual Deprivation
title_sort dynamics of visual perceptual echoes following short-term visual deprivation
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8152942/
https://www.ncbi.nlm.nih.gov/pubmed/34296091
http://dx.doi.org/10.1093/texcom/tgaa012
work_keys_str_mv AT schwenkjakobcb dynamicsofvisualperceptualechoesfollowingshorttermvisualdeprivation
AT vanrullenrufin dynamicsofvisualperceptualechoesfollowingshorttermvisualdeprivation
AT bremmerfrank dynamicsofvisualperceptualechoesfollowingshorttermvisualdeprivation