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...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2018-01-01
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| Series: | Frontiers in Systems Neuroscience |
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| Online Access: | http://journal.frontiersin.org/article/10.3389/fnsys.2018.00001/full |
| _version_ | 1811240996830183424 |
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| author | Devin H. Kehoe Devin H. Kehoe Devin H. Kehoe Devin H. Kehoe Maryam Rahimi Maryam Rahimi Mazyar Fallah Mazyar Fallah Mazyar Fallah Mazyar Fallah Mazyar Fallah |
| author_facet | Devin H. Kehoe Devin H. Kehoe Devin H. Kehoe Devin H. Kehoe Maryam Rahimi Maryam Rahimi Mazyar Fallah Mazyar Fallah Mazyar Fallah Mazyar Fallah Mazyar Fallah |
| author_sort | Devin H. Kehoe |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-12T13:29:14Z |
| format | Article |
| id | doaj.art-596348be7198473fabf7c7c209a276d2 |
| institution | Directory Open Access Journal |
| issn | 1662-5137 |
| language | English |
| last_indexed | 2024-04-12T13:29:14Z |
| publishDate | 2018-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Systems Neuroscience |
| spelling | doaj.art-596348be7198473fabf7c7c209a276d22022-12-22T03:31:13ZengFrontiers Media S.A.Frontiers in Systems Neuroscience1662-51372018-01-011210.3389/fnsys.2018.00001319780Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased SelectionDevin H. Kehoe0Devin H. Kehoe1Devin H. Kehoe2Devin H. Kehoe3Maryam Rahimi4Maryam Rahimi5Mazyar Fallah6Mazyar Fallah7Mazyar Fallah8Mazyar Fallah9Mazyar Fallah10Department of Psychology, York University, Toronto, ON, CanadaCentre for Vision Research, York University, Toronto, ON, CanadaVision Science to Applications (VISTA), York University, Toronto, ON, CanadaCanadian Action and Perception Network, York University, Toronto, ON, CanadaDepartment of Psychology, York University, Toronto, ON, CanadaCentre for Vision Research, York University, Toronto, ON, CanadaDepartment of Psychology, York University, Toronto, ON, CanadaCentre for Vision Research, York University, Toronto, ON, CanadaVision Science to Applications (VISTA), York University, Toronto, ON, CanadaCanadian Action and Perception Network, York University, Toronto, ON, CanadaSchool of Kinesiology and Heath Science, York University, Toronto, ON, CanadaThe 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.http://journal.frontiersin.org/article/10.3389/fnsys.2018.00001/fulloculomotor processingoculomotor representationscolormemory-guided saccadessaccade curvaturetarget selection |
| spellingShingle | Devin H. Kehoe Devin H. Kehoe Devin H. Kehoe Devin H. Kehoe Maryam Rahimi Maryam Rahimi Mazyar Fallah Mazyar Fallah Mazyar Fallah Mazyar Fallah Mazyar Fallah Perceptual Color Space Representations in the Oculomotor System Are Modulated by Surround Suppression and Biased Selection Frontiers in Systems Neuroscience oculomotor processing oculomotor representations color memory-guided saccades saccade curvature target 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 | oculomotor processing oculomotor representations color memory-guided saccades saccade curvature target selection |
| url | http://journal.frontiersin.org/article/10.3389/fnsys.2018.00001/full |
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