Functional connectivity of auditory and visual areas during rest and stimulus presentation.
Mullinger K, Bowtell R, Morgan P, Auer D
University of Nottingham
The correlation of signal fluctuations in visual and auditory cortices and changes in the pattern of connectivity occurring due to presentation of visual and auditory stimuli are studied here using whole-brain fMRI. Concurrent EEG recording was used to monitor changes in brain state, and to compare of EEG power fluctuation with BOLD signal variation. The results show that there are significantly sized regions of visual and auditory cortex that exhibit correlated signal fluctuations during the resting state, with a reduction in this correlation when stimuli are presented. Measurement of alpha power indicates a change in electrical activity during stimulus presentation.