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Fixation-related saccadic inhibition in free viewing in response to stimulus saliency

Microsaccades that occur during fixation were studied extensively in response to transient stimuli, showing a typical inhibition (Oculomotor Inhibition, OMI), and a later release with a latency that depends on stimulus saliency, attention, and expectations. Here, we investigated the hypothesis that...

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Autores principales: Kadosh, Oren, Bonneh, Yoram S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9033846/
https://www.ncbi.nlm.nih.gov/pubmed/35459790
http://dx.doi.org/10.1038/s41598-022-10605-1
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author Kadosh, Oren
Bonneh, Yoram S.
author_facet Kadosh, Oren
Bonneh, Yoram S.
author_sort Kadosh, Oren
collection PubMed
description Microsaccades that occur during fixation were studied extensively in response to transient stimuli, showing a typical inhibition (Oculomotor Inhibition, OMI), and a later release with a latency that depends on stimulus saliency, attention, and expectations. Here, we investigated the hypothesis that in free viewing every saccade provides a new transient stimulation that should result in a stimulus-dependent OMI like a flashed presentation during fixation. Participants (N = 16) freely inspected static displays of randomly oriented Gabor texture images, with varied contrast and spatial frequency (SF) for periods of 10 s each. Eye tracking recordings were divided into epochs triggered by saccade landing (> 1 dva), and microsaccade latency relative to fixation onset was computed (msRT). We found that the msRT in free viewing was shorter for more salient stimuli (higher contrast or lower SF), as previously found for flashed stimuli. It increased with saccade size and decreased across successive saccades, but only for higher contrast, suggesting contrast-dependent repetition enhancement in free viewing. Our results indicate that visual stimulus-dependent inhibition of microsaccades also applies to free viewing. These findings are in agreement with the similarity found between event-related and fixation-related potentials and open the way for studies combining both approaches to study natural vision.
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spelling pubmed-90338462022-04-25 Fixation-related saccadic inhibition in free viewing in response to stimulus saliency Kadosh, Oren Bonneh, Yoram S. Sci Rep Article Microsaccades that occur during fixation were studied extensively in response to transient stimuli, showing a typical inhibition (Oculomotor Inhibition, OMI), and a later release with a latency that depends on stimulus saliency, attention, and expectations. Here, we investigated the hypothesis that in free viewing every saccade provides a new transient stimulation that should result in a stimulus-dependent OMI like a flashed presentation during fixation. Participants (N = 16) freely inspected static displays of randomly oriented Gabor texture images, with varied contrast and spatial frequency (SF) for periods of 10 s each. Eye tracking recordings were divided into epochs triggered by saccade landing (> 1 dva), and microsaccade latency relative to fixation onset was computed (msRT). We found that the msRT in free viewing was shorter for more salient stimuli (higher contrast or lower SF), as previously found for flashed stimuli. It increased with saccade size and decreased across successive saccades, but only for higher contrast, suggesting contrast-dependent repetition enhancement in free viewing. Our results indicate that visual stimulus-dependent inhibition of microsaccades also applies to free viewing. These findings are in agreement with the similarity found between event-related and fixation-related potentials and open the way for studies combining both approaches to study natural vision. Nature Publishing Group UK 2022-04-22 /pmc/articles/PMC9033846/ /pubmed/35459790 http://dx.doi.org/10.1038/s41598-022-10605-1 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Kadosh, Oren
Bonneh, Yoram S.
Fixation-related saccadic inhibition in free viewing in response to stimulus saliency
title Fixation-related saccadic inhibition in free viewing in response to stimulus saliency
title_full Fixation-related saccadic inhibition in free viewing in response to stimulus saliency
title_fullStr Fixation-related saccadic inhibition in free viewing in response to stimulus saliency
title_full_unstemmed Fixation-related saccadic inhibition in free viewing in response to stimulus saliency
title_short Fixation-related saccadic inhibition in free viewing in response to stimulus saliency
title_sort fixation-related saccadic inhibition in free viewing in response to stimulus saliency
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9033846/
https://www.ncbi.nlm.nih.gov/pubmed/35459790
http://dx.doi.org/10.1038/s41598-022-10605-1
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