Top-down modulation in visual cortex carried by high-frequency oscillatory synchronization
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1
Florida Atlantic University, United States
Brain-imaging studies have shown that distributed networks of visual occipital cortical areas are co-activated in anticipatory visual attention. It is generally believed that this co-activation reflects top-down modulation of lower-level visual occipital areas by higher-level ones. We hypothesized that top-down modulation of striate cortex by extrastriate visual occipital areas in anticipatory visual attention depends on directed influences carried by synchronized high-frequency (beta and gamma range) oscillatory activity. We used MultiVariate Auto-Regressive (MVAR) modeling and spectral-domain Granger causality analysis to measure top-down and bottom-up influences between Local Field Potential (LFP) recordings from striate and extrastriate recording sites in macaque monkeys. Granger causality spectra were measured preceding an anticipated visual stimulus to determine whether top-down high-frequency Granger causal influences played a functional role in anticipatory visual attention.
Conference:
10th International Conference on Cognitive Neuroscience, Bodrum, Türkiye, 1 Sep - 5 Sep, 2008.
Presentation Type:
Oral Presentation
Topic:
Symposium 7: Putative mechanisms of high frequency oscillation
with evidence from different species
Citation:
Bressler
SL and
Richter
C
(2008). Top-down modulation in visual cortex carried by high-frequency oscillatory synchronization.
Conference Abstract:
10th International Conference on Cognitive Neuroscience.
doi: 10.3389/conf.neuro.09.2009.01.036
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Received:
27 Nov 2008;
Published Online:
27 Nov 2008.
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Correspondence:
S. L Bressler, Florida Atlantic University, Boca Raton, United States, bressler@fau.edu