Journal
FRONTIERS IN HUMAN NEUROSCIENCE
Volume 4, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fnhum.2010.00197
Keywords
electrocorticography; occipital cortex; vision; broadband; rhythm; phase-amplitude coupling; nested oscillation; beta
Categories
Funding
- National Aeronautics and Space Administration
- National Institute of General Medical Sciences
- National Science Foundation [0622252, 0642848]
- National Institute of Health [R21-DA024423, RO1-NS12542, R01-NS065186]
- James S. McDonnell fund [22 3921 26239B]
- Direct For Computer & Info Scie & Enginr
- Division of Computing and Communication Foundations [0622252] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0930908] Funding Source: National Science Foundation
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [0642848] Funding Source: National Science Foundation
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Brain rhythms are more than just passive phenomena in visual cortex. For the first time, we show that the physiology underlying brain rhythms actively suppresses and releases cortical areas on a second-to-second basis during visual processing. Furthermore, their influence is specific at the scale of individual gyri. We quantified the interaction between broadband spectral change and brain rhythms on a second-to-second basis in electrocorticographic (ECoG) measurement of brain surface potentials in five human subjects during a visual search task. Comparison of visual search epochs with a blank screen baseline revealed changes in the raw potential, the amplitude of rhythmic activity, and in the decoupled broadband spectral amplitude. We present new methods to characterize the intensity and preferred phase of coupling between broadband power and band-limited rhythms, and to estimate the magnitude of rhythm-to-broadband modulation on a trial-by-trial basis. These tools revealed numerous coupling motifs between the phase of low-frequency (delta, theta, alpha, beta, and gamma band) rhythms and the amplitude of broadband spectral change. In the theta and beta ranges, the coupling of phase to broadband change is dynamic during visual processing, decreasing in some occipital areas and increasing in others, in a gyrally specific pattern. Finally, we demonstrate that the rhythms interact with one another across frequency ranges, and across cortical sites.
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