The Dual Facet of Gamma Oscillations: Separate Visual and Decision Making Circuits as Revealed by Simultaneous EEG/fMRI

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dc.contributor.authorCastelhano, Joao
dc.contributor.authorDuarte, Isabel Catarina
dc.contributor.authorWibral, Michael
dc.contributor.authorRodriguez, Eugenio
dc.contributor.authorCastelo-Branco, Miguel
dc.date.accessioned2025-01-23T21:42:11Z
dc.date.available2025-01-23T21:42:11Z
dc.date.issued2014
dc.description.abstractIt remains an outstanding question whether gamma-band oscillations reflect unitary cognitive processes within the same task. EEG/MEG studies do lack the resolution or coverage to address the highly debated question whether single gamma activity patterns are linked with multiple cognitive modules or alternatively each pattern associates with a specific cognitive module, within the same coherent perceptual task. One way to disentangle these issues would be to provide direct identification of their sources, by combining different techniques. Here, we directly examined these questions by performing simultaneous EEG/fMRI using an ambiguous perception paradigm requiring holistic integration. We found that distinct gamma frequency sub-bands reflect different neural substrates and cognitive mechanisms when comparing object perception states vs. no categorical perception. A low gamma sub-band (near 40 Hz) activity was tightly related to the decision making network, and in particular the anterior insula. A high gamma sub-band (approximate to 60 Hz) could be linked to early visual processing regions. The demonstration of a clear functional topography for distinct gamma sub-bands within the same task shows that distinct gamma-band modulations underlie sensory processing and perceptual decision mechanisms. Hum Brain Mapp 35:5219-5235, 2014. 2014 Wiley Periodicals, Inc.
dc.fuente.origenWOS
dc.identifier.doi10.1002/hbm.22545
dc.identifier.eissn1097-0193
dc.identifier.issn1065-9471
dc.identifier.urihttps://doi.org/10.1002/hbm.22545
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101655
dc.identifier.wosidWOS:000342667400020
dc.issue.numero10
dc.language.isoen
dc.pagina.final5235
dc.pagina.inicio5219
dc.revistaHuman brain mapping
dc.rightsacceso restringido
dc.subjectgamma-band oscillations
dc.subjectsimultaneous EEG
dc.subjectfMRI
dc.subjectsource localization
dc.subjectvisual perception
dc.subjectcognitive modules
dc.subjectmultimodal imaging
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleThe Dual Facet of Gamma Oscillations: Separate Visual and Decision Making Circuits as Revealed by Simultaneous EEG/fMRI
dc.typeartículo
dc.volumen35
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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