We thank Mr. Takeshima for technical assistance.
Cortical dynamics of the visual change detection process
Article first published online: 4 MAR 2010
Copyright © 2010 Society for Psychophysiological Research
Volume 47, Issue 5, pages 905–912, September 2010
How to Cite
Urakawa, T., Inui, K., Yamashiro, K. and Kakigi, R. (2010), Cortical dynamics of the visual change detection process. Psychophysiology, 47: 905–912. doi: 10.1111/j.1469-8986.2010.00987.x
- Issue published online: 2 AUG 2010
- Article first published online: 4 MAR 2010
- (Received July 9, 2009; Accepted September 21, 2009)
- Visual change detection
In this study, the cortical dynamics of the visual change detection process were investigated using an oddball paradigm similar to that used in auditory mismatch negativity studies. When subjects watched a silent movie, color stimuli were presented using 280 dual color LEDs arranged along the frame of the video screen. Task-irrelevant red and blue color stimuli were presented randomly at a probability of 10% and 90%, respectively, in one session and vice versa for the other one, and we traced brain responses using magnetoencephalography. Results show that activation in the middle occipital gyrus (MOG) was significantly enhanced for the infrequent stimulus, while early activities in Brodmann's area 17/18 were comparable for the frequent and infrequent stimuli. These results suggest that automatic visual change detection is associated with the MOG activity.