title: Functional roles of 10 Hz alpha-band power modulating engagement and disengagement of cortical networks in a complex visual motion task.
abstract: Alpha band power, particularly at the 10 Hz frequency, is significantly involved in sensory inhibition, attention modulation, and working memory. However, the interactions between cortical areas and their relationship to the different functional roles of the alpha band oscillations are still poorly understood. Here we examined alpha band power and the cortico-cortical interregional phase synchrony in a psychophysical task involving the detection of an object moving in depth by an observer in forward self-motion. Wavelet filtering at the 10 Hz frequency revealed differences in the profile of cortical activation in the visual processing regions (occipital and parietal lobes) and in the frontoparietal regions. The alpha rhythm driving the visual processing areas was found to be asynchronous with the frontoparietal regions. These findings suggest a decoupling of the 10 Hz frequency into separate functional roles: sensory inhibition in the visual processing regions and spatial attention in the frontoparietal regions.
authors.affiliation: Boston University, Brain and Vision Research Laboratory, Department of Biomedical Engineering, Boston, Massachusetts, United States of America.
authors.forename: Kunjan D
authors.initials: KD
authors.lastname: Rana
authors.affiliation: Boston University, Brain and Vision Research Laboratory, Department of Biomedical Engineering, Boston, Massachusetts, United States of America; Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States of America; Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts, United States of America.
authors.forename: Lucia M
authors.initials: LM
authors.lastname: Vaina
mesh_terms: D000293:Adolescent; D000513:Alpha Rhythm / Q000502:physiology*; D001519:Behavior; D002540:Cerebral Cortex / Q000502:physiology*; D003344:Cortical Synchronization; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D009415:Nerve Net / Q000502:physiology*; D010775:Photic Stimulation; D013647:Task Performance and Analysis; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult