Large-Scale Gamma-Band Phase Synchronization and Selective Attention
Open Access
- 7 June 2007
- journal article
- Published by Oxford University Press (OUP) in Cerebral Cortex
- Vol. 18 (2), 386-396
- https://doi.org/10.1093/cercor/bhm073
Abstract
Explaining the emergence of a coherent conscious percept and an intentional agent from the activity of distributed neurons is key to understanding how the brain produces higher cognitive processes. Gamma-band synchronization has been proposed to be a mechanism for the functional integration of neural populations that together form a transitory, large-scale, task- and/or percept-specific network. The operation of this mechanism in the context of attention orienting entails that cortical regions representing attended locations should show more gamma-band synchronization with other cortical areas than would those representing unattended locations. This increased synchronization should be apparent in the same time frame as that of the deployment of attention to a particular location. In order to observe this effect, we made electroencephalogram recordings while subjects attended to one side or the other of the visual field (which we confirmed by event-related potential analysis) and calculated phase-locking statistics between the signals recorded at relevant electrode pairs. We observed increased gamma-band phase synchronization between visual cortex contralateral to the attended location and other, widespread, cortical areas approximately 240–380 ms after the directional cue was presented, confirming the prediction of a large-scale gamma synchronous network oriented to the cued location.Keywords
This publication has 49 references indexed in Scilit:
- High Gamma Power Is Phase-Locked to Theta Oscillations in Human NeocortexScience, 2006
- Origin, structure, and role of background EEG activity. Part 1. Analytic amplitudeClinical Neurophysiology, 2004
- EEGLAB: an open source toolbox for analysis of single-trial EEG dynamics including independent component analysisJournal of Neuroscience Methods, 2004
- Human memory formation is accompanied by rhinal–hippocampal coupling and decouplingNature Neuroscience, 2001
- Towards a cognitive neuroscience of consciousness: basic evidence and a workspace frameworkCognition, 2001
- Stimulus-specific fast oscillations at zero phase between visual areas V1 and V2 of awake monkeyNeuroReport, 1994
- Shifting visual attention between objects and locations: Evidence from normal and parietal lesion subjects.Journal of Experimental Psychology: General, 1994
- Direct physiological evidence for scene segmentation by temporal coding.Proceedings of the National Academy of Sciences, 1991
- Synchronization of oscillatory neuronal responses between striate and extrastriate visual cortical areas of the cat.Proceedings of the National Academy of Sciences, 1991
- Interhemispheric Synchronization of Oscillatory Neuronal Responses in Cat Visual CortexScience, 1991