Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China.
Psychophysiology. 2011 May;48(5):665-75. doi: 10.1111/j.1469-8986.2010.01132.x. Epub 2010 Sep 27.
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.
本研究使用与任务相关的听觉/视觉刺激同时记录的稳态视觉诱发电位（SSVEP）来研究跨模态和交叉模态空间注意对视觉处理的影响。SSVEP 由与任务不相关的 10/15Hz 棋盘格翻转模式诱发。参与者被要求仅对注意模态的注意侧的偏差瞬态刺激做出反应。采用锁相指数（PLI）方法来描述 SSVEP。单模态和跨模态空间注意都导致对侧枕叶脑区的 PLI 值增加。当听觉模态而不是视觉模态被注意时，在相同的脑区观察到跨模态注意效应，表现为 PLI 的增加。这些发现支持了最近的假说，即早期感觉皮层的脑活动的相位重置是多感觉相互作用的一个重要机制。
