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The power of human brain magnetoencephalographic signals can be modulated up or down by changes in an attentive visual task
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posted on 2023-06-08, 09:24 authored by Yanqing Chen, Anil SethAnil Seth, Joseph A Gally, Gerald M EdelmanThis paper presents evidence indicating that the signals generated by neural responses to visual input can be either enhanced by increasing or suppressed by decreasing the area of the stimuli to which attention is directed. We used magnetoencephalography (MEG) to measure the frequency-tagged steady-state visual evoked responses of 11 subjects when presented with two superimposed images flickering at different frequencies. Each image consisted of 7 parallel bars of equal length; in any image, all bars were either red or green and were either horizontal or vertical. At randomly chosen times during the experiments, any one of the three middle bars in either image transiently increased or decreased in width. Subjects were asked to attend to one image and ignore the other, and to respond to changes in bar width in the attended image with a key-press. In one condition, subject responses were required for changes in any of the 3 central bars of the attended image. We found that visual steady-state evoked responses to the attended image were enhanced relative to those evoked by the unattended image in this condition. In a second condition, subject responses were required for changes only in the middle bar. In this condition, the responses to the attended image were suppressed relative to those of the unattended image. These results may reflect relative differences in the synchronization and desynchronization of responding neuronal populations.
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Publication status
- Published
Journal
Proceedings of the National Academy of SciencesISSN
0027-8424Publisher
National Academy of SciencesExternal DOI
Issue
6Volume
100Page range
3501-3506Department affiliated with
- Informatics Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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