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Proceedings Paper

Behavioral stochastic resonance associated with large-scale synchronization of human brain activity
Author(s): Keiichi Kitajo; Kentaro Yamanaka; Daichi Nozaki; Lawrence M. Ward; Yoshiharu Yamamoto
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Paper Abstract

We demonstrate experimentally that enhanced detection of weak visual signals by addition of visual noise is accompanied by an increase in phase synchronization of EEG signals across widely-separated areas of the human brain. In our sensorimotor integration task, observers responded to a weak rectangular gray-level signal presented to their right eyes by pressing and releasing a button whenever they detected an increment followed by a decrement in brightness. Signal detection performance was optimized by presenting randomly-changing-gray-level noise separately to observers' left eyes using a mirror stereoscope. We measured brain electrical activity at the scalp by electroencephalograph (EEG), calculated the instantaneous phase for each EEG signal, and evaluated the degree of large-scale phase synchronization between pairs of EEG signals. Dynamic synchronization-desynchronization patterns were observed and we found evidence of noise-enhanced large-scale synchronization associated with detection of the brightness changes under conditions of noise-enhanced performance. Our results suggest that behavioral stochastic resonance might arise from noise-enhanced synchronization of neural activities across widespread brain regions.

Paper Details

Date Published: 25 May 2004
PDF: 11 pages
Proc. SPIE 5467, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems II, (25 May 2004); doi: 10.1117/12.547196
Show Author Affiliations
Keiichi Kitajo, Univ. of British Columbia (Canada)
Univ. of Tokyo (Japan)
Kentaro Yamanaka, Univ. of Tokyo (Japan)
Daichi Nozaki, National Rehabilitation Ctr. for the Disabled (Japan)
Lawrence M. Ward, Univ. of British Columbia (Canada)
Yoshiharu Yamamoto, Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)


Published in SPIE Proceedings Vol. 5467:
Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems II
Derek Abbott; Sergey M. Bezrukov; Andras Der; Angel Sanchez, Editor(s)

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