BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading
Under conditions of visual fixation, perceptual fading occurs when a stationary object, though present in the world and continually casting light upon the retina, vanishes from visual consciousness. The neural correlates of the consciousness of such an object will presumably modulate in activity wit...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Public Library of Science
2011
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| Online Access: | http://hdl.handle.net/1721.1/64988 |
| _version_ | 1811082987847024640 |
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| author | Hsieh, Po-Jang Tse, Peter U. |
| author2 | McGovern Institute for Brain Research at MIT |
| author_facet | McGovern Institute for Brain Research at MIT Hsieh, Po-Jang Tse, Peter U. |
| author_sort | Hsieh, Po-Jang |
| collection | MIT |
| description | Under conditions of visual fixation, perceptual fading occurs when a stationary object, though present in the world and continually casting light upon the retina, vanishes from visual consciousness. The neural correlates of the consciousness of such an object will presumably modulate in activity with the onset and cessation of perceptual fading.
Method
In order to localize the neural correlates of perceptual fading, a green disk that had been individually set to be equiluminant with the orange background, was presented in one of the four visual quadrants; Subjects indicated with a button press whether or not the disk was subjectively visible as it perceptually faded in and out.
Results
Blood oxygen-level dependent (BOLD) signal in V1 and ventral retinotopic areas V2v and V3v decreases when the disk subjectively disappears, and increases when it subjectively reappears. This effect occurs in early visual areas both ipsilaterally and contralaterally to the fading figure. That is, it occurs regardless of whether the fading stimulus is presented inside or outside of the corresponding portion of visual field. In addition, we find that the microsaccade rate rises before and after perceptual transitions from not seeing to seeing the disk, and decreases before perceptual transitions from seeing to not seeing the disk. These BOLD signal changes could be driven by a global process that operates across contralateral and ipsilateral visual cortex or by a confounding factor, such as microsaccade rate. |
| first_indexed | 2024-09-23T12:16:43Z |
| format | Article |
| id | mit-1721.1/64988 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:16:43Z |
| publishDate | 2011 |
| publisher | Public Library of Science |
| record_format | dspace |
| spelling | mit-1721.1/649882022-09-28T00:52:27Z BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading Hsieh, Po-Jang Tse, Peter U. McGovern Institute for Brain Research at MIT Hsieh, Po-Jang Hsieh, Po-Jang Under conditions of visual fixation, perceptual fading occurs when a stationary object, though present in the world and continually casting light upon the retina, vanishes from visual consciousness. The neural correlates of the consciousness of such an object will presumably modulate in activity with the onset and cessation of perceptual fading. Method In order to localize the neural correlates of perceptual fading, a green disk that had been individually set to be equiluminant with the orange background, was presented in one of the four visual quadrants; Subjects indicated with a button press whether or not the disk was subjectively visible as it perceptually faded in and out. Results Blood oxygen-level dependent (BOLD) signal in V1 and ventral retinotopic areas V2v and V3v decreases when the disk subjectively disappears, and increases when it subjectively reappears. This effect occurs in early visual areas both ipsilaterally and contralaterally to the fading figure. That is, it occurs regardless of whether the fading stimulus is presented inside or outside of the corresponding portion of visual field. In addition, we find that the microsaccade rate rises before and after perceptual transitions from not seeing to seeing the disk, and decreases before perceptual transitions from seeing to not seeing the disk. These BOLD signal changes could be driven by a global process that operates across contralateral and ipsilateral visual cortex or by a confounding factor, such as microsaccade rate. National Institutes of Health (U.S.) (NIH R03 MH0609660-01) 2011-07-29T18:15:15Z 2011-07-29T18:15:15Z 2011-03 2010-12 Article http://purl.org/eprint/type/JournalArticle 1932-6203 http://hdl.handle.net/1721.1/64988 Hsieh, Po-Jang, and Peter U. Tse. “BOLD Signal in Both Ipsilateral and Contralateral Retinotopic Cortex Modulates with Perceptual Fading.” Ed. Chris I. Baker. PLoS ONE 5.3 (2010) : e9638. en_US http://dx.doi.org/10.1371/journal.pone.0009638 PLoS ONE Creative Commons Attribution http://creativecommons.org/licenses/by/2.5/ application/pdf Public Library of Science PLoS |
| spellingShingle | Hsieh, Po-Jang Tse, Peter U. BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| title | BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| title_full | BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| title_fullStr | BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| title_full_unstemmed | BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| title_short | BOLD signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| title_sort | bold signal in both ipsilateral and contralateral retinotopic cortex with perceptual fading |
| url | http://hdl.handle.net/1721.1/64988 |
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