This work was supported by 973 Program of China (No. 2011CB933204), the National Natural Science Foundation of China under grants #30630022 and #90820304, and the Sino-German Research Training Group CINACS.
Exploring steady-state visual evoked potentials as an index for intermodal and crossmodal spatial attention
Article first published online: 27 SEP 2010
Copyright © 2010 Society for Psychophysiological Research
Volume 48, Issue 5, pages 665–675, May 2011
How to Cite
Zhang, D., Hong, B., Gao, X., Gao, S. and Röder, B. (2011), Exploring steady-state visual evoked potentials as an index for intermodal and crossmodal spatial attention. Psychophysiology, 48: 665–675. doi: 10.1111/j.1469-8986.2010.01132.x
- Issue published online: 1 APR 2011
- Article first published online: 27 SEP 2010
- (Received March 5, 2010; Accepted August 3, 2010)
- Steady-state visual evoked potential;
- Spatial attention;
- Phase-locking index
The present study used steady-state visual evoked potentials (SSVEPs) recorded in parallel to a task-relevant auditory/visual stimulation to study the process of intermodal and crossmodal spatial attention on visual processing. SSVEPs were elicited by task-irrelevant 10/15Hz pattern-reversing checkerboards. The participants were asked to respond to deviant transient stimuli of the attended side in the attended modality only. A phase-locking index (PLI) method was employed to characterize SSVEPs. Both unimodal and crossmodal spatial attention resulted in an increase of PLI values over contralateral occipital brain regions. Intermodal attention effects were observed as an increase of the PLI over the same brain areas when the auditory rather than the visual modality was attended. These findings support recent hypotheses that the phase resetting of the brain activity in early sensory cortices is an essential mechanism of multisensory interaction.