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Increased Synchronization of Neuromagnetic Responses during Conscious Perception

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Bibliographische Detailangaben
Zeitschriftentitel: The Journal of Neuroscience
Personen und Körperschaften: Srinivasan, Ramesh, Russell, D. Patrick, Edelman, Gerald M., Tononi, Giulio
In: The Journal of Neuroscience, 19, 1999, 13, S. 5435-5448
Format: E-Article
Sprache: Englisch
veröffentlicht:
Society for Neuroscience
Schlagwörter:
General Neuroscience
author_facet Srinivasan, Ramesh
Russell, D. Patrick
Edelman, Gerald M.
Tononi, Giulio
Srinivasan, Ramesh
Russell, D. Patrick
Edelman, Gerald M.
Tononi, Giulio
author Srinivasan, Ramesh
Russell, D. Patrick
Edelman, Gerald M.
Tononi, Giulio
spellingShingle Srinivasan, Ramesh
Russell, D. Patrick
Edelman, Gerald M.
Tononi, Giulio
The Journal of Neuroscience
Increased Synchronization of Neuromagnetic Responses during Conscious Perception
General Neuroscience
author_sort srinivasan, ramesh
spelling Srinivasan, Ramesh Russell, D. Patrick Edelman, Gerald M. Tononi, Giulio 0270-6474 1529-2401 Society for Neuroscience General Neuroscience http://dx.doi.org/10.1523/jneurosci.19-13-05435.1999 <jats:p>In binocular rivalry, the observer views two incongruent images, one through each eye, but is conscious of only one image at a time. The image that is perceptually dominant alternates every few seconds. We used this phenomenon to investigate neural correlates of conscious perception. We presented a red vertical grating to one eye and a blue horizontal grating to the other eye, with each grating continuously flickering at a distinct frequency (the frequency tag for that stimulus). Steady-state magnetic fields were recorded with a 148 sensor whole-head magnetometer while the subjects reported which grating was perceived. The power of the steady-state magnetic field at the frequency associated with a grating typically increased at multiple sensors when the grating was perceived. Changes in power related to perceptual dominance, presumably reflecting local neural synchronization, reached statistical significance at several sensors, including some positioned over occipital, temporal, and frontal cortices. To identify changes in synchronization between distinct brain areas that were related to perceptual dominance, we analyzed coherence between pairs of widely separated sensors. The results showed that when the stimulus was perceived there was a marked increase in both interhemispheric and intrahemispheric coherence at the stimulus frequency. This study demonstrates a direct correlation between the conscious perception of a visual stimulus and the synchronous activity of large populations of neocortical neurons as reflected by stimulus-evoked steady-state neuromagnetic fields.</jats:p> Increased Synchronization of Neuromagnetic Responses during Conscious Perception The Journal of Neuroscience
doi_str_mv 10.1523/jneurosci.19-13-05435.1999
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title Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_unstemmed Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_full Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_fullStr Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_full_unstemmed Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_short Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_sort increased synchronization of neuromagnetic responses during conscious perception
topic General Neuroscience
url http://dx.doi.org/10.1523/jneurosci.19-13-05435.1999
publishDate 1999
physical 5435-5448
description <jats:p>In binocular rivalry, the observer views two incongruent images, one through each eye, but is conscious of only one image at a time. The image that is perceptually dominant alternates every few seconds. We used this phenomenon to investigate neural correlates of conscious perception. We presented a red vertical grating to one eye and a blue horizontal grating to the other eye, with each grating continuously flickering at a distinct frequency (the frequency tag for that stimulus). Steady-state magnetic fields were recorded with a 148 sensor whole-head magnetometer while the subjects reported which grating was perceived. The power of the steady-state magnetic field at the frequency associated with a grating typically increased at multiple sensors when the grating was perceived. Changes in power related to perceptual dominance, presumably reflecting local neural synchronization, reached statistical significance at several sensors, including some positioned over occipital, temporal, and frontal cortices. To identify changes in synchronization between distinct brain areas that were related to perceptual dominance, we analyzed coherence between pairs of widely separated sensors. The results showed that when the stimulus was perceived there was a marked increase in both interhemispheric and intrahemispheric coherence at the stimulus frequency. This study demonstrates a direct correlation between the conscious perception of a visual stimulus and the synchronous activity of large populations of neocortical neurons as reflected by stimulus-evoked steady-state neuromagnetic fields.</jats:p>
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author Srinivasan, Ramesh, Russell, D. Patrick, Edelman, Gerald M., Tononi, Giulio
author_facet Srinivasan, Ramesh, Russell, D. Patrick, Edelman, Gerald M., Tononi, Giulio, Srinivasan, Ramesh, Russell, D. Patrick, Edelman, Gerald M., Tononi, Giulio
author_sort srinivasan, ramesh
container_issue 13
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description <jats:p>In binocular rivalry, the observer views two incongruent images, one through each eye, but is conscious of only one image at a time. The image that is perceptually dominant alternates every few seconds. We used this phenomenon to investigate neural correlates of conscious perception. We presented a red vertical grating to one eye and a blue horizontal grating to the other eye, with each grating continuously flickering at a distinct frequency (the frequency tag for that stimulus). Steady-state magnetic fields were recorded with a 148 sensor whole-head magnetometer while the subjects reported which grating was perceived. The power of the steady-state magnetic field at the frequency associated with a grating typically increased at multiple sensors when the grating was perceived. Changes in power related to perceptual dominance, presumably reflecting local neural synchronization, reached statistical significance at several sensors, including some positioned over occipital, temporal, and frontal cortices. To identify changes in synchronization between distinct brain areas that were related to perceptual dominance, we analyzed coherence between pairs of widely separated sensors. The results showed that when the stimulus was perceived there was a marked increase in both interhemispheric and intrahemispheric coherence at the stimulus frequency. This study demonstrates a direct correlation between the conscious perception of a visual stimulus and the synchronous activity of large populations of neocortical neurons as reflected by stimulus-evoked steady-state neuromagnetic fields.</jats:p>
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spelling Srinivasan, Ramesh Russell, D. Patrick Edelman, Gerald M. Tononi, Giulio 0270-6474 1529-2401 Society for Neuroscience General Neuroscience http://dx.doi.org/10.1523/jneurosci.19-13-05435.1999 <jats:p>In binocular rivalry, the observer views two incongruent images, one through each eye, but is conscious of only one image at a time. The image that is perceptually dominant alternates every few seconds. We used this phenomenon to investigate neural correlates of conscious perception. We presented a red vertical grating to one eye and a blue horizontal grating to the other eye, with each grating continuously flickering at a distinct frequency (the frequency tag for that stimulus). Steady-state magnetic fields were recorded with a 148 sensor whole-head magnetometer while the subjects reported which grating was perceived. The power of the steady-state magnetic field at the frequency associated with a grating typically increased at multiple sensors when the grating was perceived. Changes in power related to perceptual dominance, presumably reflecting local neural synchronization, reached statistical significance at several sensors, including some positioned over occipital, temporal, and frontal cortices. To identify changes in synchronization between distinct brain areas that were related to perceptual dominance, we analyzed coherence between pairs of widely separated sensors. The results showed that when the stimulus was perceived there was a marked increase in both interhemispheric and intrahemispheric coherence at the stimulus frequency. This study demonstrates a direct correlation between the conscious perception of a visual stimulus and the synchronous activity of large populations of neocortical neurons as reflected by stimulus-evoked steady-state neuromagnetic fields.</jats:p> Increased Synchronization of Neuromagnetic Responses during Conscious Perception The Journal of Neuroscience
spellingShingle Srinivasan, Ramesh, Russell, D. Patrick, Edelman, Gerald M., Tononi, Giulio, The Journal of Neuroscience, Increased Synchronization of Neuromagnetic Responses during Conscious Perception, General Neuroscience
title Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_full Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_fullStr Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_full_unstemmed Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_short Increased Synchronization of Neuromagnetic Responses during Conscious Perception
title_sort increased synchronization of neuromagnetic responses during conscious perception
title_unstemmed Increased Synchronization of Neuromagnetic Responses during Conscious Perception
topic General Neuroscience
url http://dx.doi.org/10.1523/jneurosci.19-13-05435.1999