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Examining Local Network Processing using Multi-contact Laminar Electrode Recording
Published on: September 8, 2011
Transient process of cortical activity during Necker cube perception: from local clusters to global synchrony
Daisuke Shimaoka1, Keiichi Kitajo, Kunihiko Kaneko
1Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan. shimaoka@complex.c.u-tokyo.ac.jp.
Nonlinear Biomedical Physics
|June 5, 2010
Summary
Neural phase-synchrony, crucial for consciousness, forms dynamic clusters. These clusters connect differently based on attention and perception, revealing distinct spatio-temporal patterns linked to attentional states.
Area of Science:
- Neuroscience
- Cognitive Science
- Computational Neuroscience
Background:
- Neural phase-synchrony across distant cortical areas is linked to consciousness.
- The underlying mechanisms of global phase-synchrony generation remain unclear.
- This study investigates the transient dynamics of global phase-synchrony through phase-synchronized clusters.
Purpose of the Study:
- To investigate the dynamic organization of phase-synchronized clusters before global synchrony.
- To determine if clustering patterns depend on perceptual conditions.
- To explore the transient processes of global phase-synchrony.
Main Methods:
- Utilized electroencephalography (EEG) data.
- Applied hierarchical clustering to analyze phase-synchronized clusters based on phase locking.
- Classified dominant components and analyzed temporal changes in cluster size and spatial structure.
Main Results:
- Identified stable spatial patterns in phase-locked clusters across perceptual conditions.
- Observed transient modulation of clusters based on perceptual conditions and time since perceptual switch.
- Found that successful top-down attention led to cluster connections between frontal and occipital areas, while failed attention resulted in divided clusters.
Conclusions:
- Confirmed the existence of stable, transiently connected phase-synchronized clusters.
- Demonstrated that cluster connectivity patterns are influenced by subjects' internal states.
- Suggests that attentional states correlate with specific spatio-temporal patterns of phase-locked clusters.
