Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG

Abstract Symmetry is a highly salient feature of the natural world which requires integration of visual features over space. The aim of the current work is to isolate dynamic neural correlates of symmetry-specific integration processes. We measured steady-state visual evoked potentials (SSVEP) as pa...

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Autores principales:	Nihan Alp, Peter Jes Kohler, Naoki Kogo, Johan Wagemans, Anthony Matthew Norcia
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/13b8448ac913480db729c955ebab4ead
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spelling	oai:doaj.org-article:13b8448ac913480db729c955ebab4ead2021-12-02T11:40:35ZMeasuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG10.1038/s41598-018-24513-w2045-2322https://doaj.org/article/13b8448ac913480db729c955ebab4ead2018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-24513-whttps://doaj.org/toc/2045-2322Abstract Symmetry is a highly salient feature of the natural world which requires integration of visual features over space. The aim of the current work is to isolate dynamic neural correlates of symmetry-specific integration processes. We measured steady-state visual evoked potentials (SSVEP) as participants viewed symmetric patterns comprised of distinct spatial regions presented at two different frequencies (f1 and f2). We measured intermodulation components, shown to reflect non-linear processing at the neural level, indicating integration of spatially separated parts of the pattern. We generated a wallpaper pattern containing two reflection symmetry axes by tiling the plane with a two-fold reflection symmetric unit-pattern and split each unit-pattern diagonally into separate parts which could be presented at different frequencies. We compared SSVEPs measured for wallpapers and control patterns for which both images were equal in terms of translation and rotation symmetry but reflection symmetry could only emerge for the wallpaper pattern through integration of the image-pairs. We found that low-frequency intermodulation components differed between the wallpaper and control stimuli, indicating the presence of integration mechanisms specific to reflection symmetry. These results showed that spatial integration specific to symmetry perception can be isolated through a combination of stimulus design and the frequency tagging approach.Nihan AlpPeter Jes KohlerNaoki KogoJohan WagemansAnthony Matthew NorciaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nihan Alp Peter Jes Kohler Naoki Kogo Johan Wagemans Anthony Matthew Norcia Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG
description	Abstract Symmetry is a highly salient feature of the natural world which requires integration of visual features over space. The aim of the current work is to isolate dynamic neural correlates of symmetry-specific integration processes. We measured steady-state visual evoked potentials (SSVEP) as participants viewed symmetric patterns comprised of distinct spatial regions presented at two different frequencies (f1 and f2). We measured intermodulation components, shown to reflect non-linear processing at the neural level, indicating integration of spatially separated parts of the pattern. We generated a wallpaper pattern containing two reflection symmetry axes by tiling the plane with a two-fold reflection symmetric unit-pattern and split each unit-pattern diagonally into separate parts which could be presented at different frequencies. We compared SSVEPs measured for wallpapers and control patterns for which both images were equal in terms of translation and rotation symmetry but reflection symmetry could only emerge for the wallpaper pattern through integration of the image-pairs. We found that low-frequency intermodulation components differed between the wallpaper and control stimuli, indicating the presence of integration mechanisms specific to reflection symmetry. These results showed that spatial integration specific to symmetry perception can be isolated through a combination of stimulus design and the frequency tagging approach.
format	article
author	Nihan Alp Peter Jes Kohler Naoki Kogo Johan Wagemans Anthony Matthew Norcia
author_facet	Nihan Alp Peter Jes Kohler Naoki Kogo Johan Wagemans Anthony Matthew Norcia
author_sort	Nihan Alp
title	Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG
title_short	Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG
title_full	Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG
title_fullStr	Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG
title_full_unstemmed	Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG
title_sort	measuring integration processes in visual symmetry with frequency-tagged eeg
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/13b8448ac913480db729c955ebab4ead
work_keys_str_mv	AT nihanalp measuringintegrationprocessesinvisualsymmetrywithfrequencytaggedeeg AT peterjeskohler measuringintegrationprocessesinvisualsymmetrywithfrequencytaggedeeg AT naokikogo measuringintegrationprocessesinvisualsymmetrywithfrequencytaggedeeg AT johanwagemans measuringintegrationprocessesinvisualsymmetrywithfrequencytaggedeeg AT anthonymatthewnorcia measuringintegrationprocessesinvisualsymmetrywithfrequencytaggedeeg
_version_	1718395563459739648

Measuring Integration Processes in Visual Symmetry with Frequency-Tagged EEG

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