Noise-induced large-scale phase synchronization of human-brain activity associated with behavioural stochastic resonanceK. Kitajo1, 2, 3, S. M. Doesburg3, K. Yamanaka2, D. Nozaki2, L. M. Ward3 and Y. Yamamoto2
1 Laboratory for Dynamics of Emergent Intelligence, RIKEN Brain Science Institute 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2 Educational Physiology Laboratory, Graduate School of Education, The University of Tokyo 7-3-1 Bunkyo-ku, Tokyo, 113-0033, Japan
3 Psychophysics and Cognitive Neuroscience Laboratory, Department of Psychology, The University of British Columbia - 2136 West Mall, Vancouver, British Columbia, V6T 1Z4, Canada
received 27 June 2007; accepted in final form 24 September 2007; published November 2007
published online 23 October 2007
We demonstrate that both detection of weak visual signals to the right eye and phase synchronization of electro-encephalogram (EEG) signals from widely separated areas of the human brain are increased by addition of weak visual noise to the left eye. We found a close relationship between the resulting noise-induced changes in behavioural performance and the similarly resulting changes in phase synchronization between widely separated brain areas. These results imply that noise-induced large-scale neural synchronization may play a significant role in information transmission in the brain.
05.40.Ca - Noise.
05.45.Xt - Synchronization; coupled oscillators.
87.19.Dd - Information processing in vision and hearing.
© Europhysics Letters Association 2007