Cargando…

Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection

The oculomotor system utilizes color extensively for planning saccades. Therefore, we examined how the oculomotor system actually encodes color and several factors that modulate these representations: attention-based surround suppression and inherent biases in selecting and encoding color categories...

Descripción completa

Detalles Bibliográficos
Autores principales: Kehoe, Devin H., Rahimi, Maryam, Fallah, Mazyar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5790808/
https://www.ncbi.nlm.nih.gov/pubmed/29434540
http://dx.doi.org/10.3389/fnsys.2018.00001
_version_ 1783296515963355136
author Kehoe, Devin H.
Rahimi, Maryam
Fallah, Mazyar
author_facet Kehoe, Devin H.
Rahimi, Maryam
Fallah, Mazyar
author_sort Kehoe, Devin H.
collection PubMed
description The oculomotor system utilizes color extensively for planning saccades. Therefore, we examined how the oculomotor system actually encodes color and several factors that modulate these representations: attention-based surround suppression and inherent biases in selecting and encoding color categories. We measured saccade trajectories while human participants performed a memory-guided saccade task with color targets and distractors and examined whether oculomotor target selection processing was functionally related to the CIE (x,y) color space distances between color stimuli and whether there were hierarchical differences between color categories in the strength and speed of encoding potential saccade goals. We observed that saccade planning was modulated by the CIE (x,y) distances between stimuli thus demonstrating that color is encoded in perceptual color space by the oculomotor system. Furthermore, these representations were modulated by (1) cueing attention to a particular color thereby eliciting surround suppression in oculomotor color space and (2) inherent selection and encoding biases based on color category independent of cueing and perceptual discriminability. Since surround suppression emerges from recurrent feedback attenuation of sensory projections, observing oculomotor surround suppression suggested that oculomotor encoding of behavioral relevance results from integrating sensory and cognitive signals that are pre-attenuated based on task demands and that the oculomotor system therefore does not functionally contribute to this process. Second, although perceptual discriminability did partially account for oculomotor processing differences between color categories, we also observed preferential processing of the red color category across various behavioral metrics. This is consistent with numerous previous studies and could not be simply explained by perceptual discriminability. Since we utilized a memory-guided saccade task, this indicates that the biased processing of the red color category does not rely on sustained sensory input and must therefore involve cortical areas associated with the highest levels of visual processing involved in visual working memory.
format Online
Article
Text
id pubmed-5790808
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher Frontiers Media S.A.
record_format MEDLINE/PubMed
spelling pubmed-57908082018-02-12 Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection Kehoe, Devin H. Rahimi, Maryam Fallah, Mazyar Front Syst Neurosci Neuroscience The oculomotor system utilizes color extensively for planning saccades. Therefore, we examined how the oculomotor system actually encodes color and several factors that modulate these representations: attention-based surround suppression and inherent biases in selecting and encoding color categories. We measured saccade trajectories while human participants performed a memory-guided saccade task with color targets and distractors and examined whether oculomotor target selection processing was functionally related to the CIE (x,y) color space distances between color stimuli and whether there were hierarchical differences between color categories in the strength and speed of encoding potential saccade goals. We observed that saccade planning was modulated by the CIE (x,y) distances between stimuli thus demonstrating that color is encoded in perceptual color space by the oculomotor system. Furthermore, these representations were modulated by (1) cueing attention to a particular color thereby eliciting surround suppression in oculomotor color space and (2) inherent selection and encoding biases based on color category independent of cueing and perceptual discriminability. Since surround suppression emerges from recurrent feedback attenuation of sensory projections, observing oculomotor surround suppression suggested that oculomotor encoding of behavioral relevance results from integrating sensory and cognitive signals that are pre-attenuated based on task demands and that the oculomotor system therefore does not functionally contribute to this process. Second, although perceptual discriminability did partially account for oculomotor processing differences between color categories, we also observed preferential processing of the red color category across various behavioral metrics. This is consistent with numerous previous studies and could not be simply explained by perceptual discriminability. Since we utilized a memory-guided saccade task, this indicates that the biased processing of the red color category does not rely on sustained sensory input and must therefore involve cortical areas associated with the highest levels of visual processing involved in visual working memory. Frontiers Media S.A. 2018-01-26 /pmc/articles/PMC5790808/ /pubmed/29434540 http://dx.doi.org/10.3389/fnsys.2018.00001 Text en Copyright © 2018 Kehoe, Rahimi and Fallah. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Kehoe, Devin H.
Rahimi, Maryam
Fallah, Mazyar
Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection
title Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection
title_full Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection
title_fullStr Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection
title_full_unstemmed Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection
title_short Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection
title_sort perceptual color space representations in the oculomotor system are modulated by surround suppression and biased selection
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5790808/
https://www.ncbi.nlm.nih.gov/pubmed/29434540
http://dx.doi.org/10.3389/fnsys.2018.00001
work_keys_str_mv AT kehoedevinh perceptualcolorspacerepresentationsintheoculomotorsystemaremodulatedbysurroundsuppressionandbiasedselection
AT rahimimaryam perceptualcolorspacerepresentationsintheoculomotorsystemaremodulatedbysurroundsuppressionandbiasedselection
AT fallahmazyar perceptualcolorspacerepresentationsintheoculomotorsystemaremodulatedbysurroundsuppressionandbiasedselection