Experimental Psychology, University of Groningen, The Netherlands.
Int J Psychophysiol. 2010 Jan;75(1):3-15. doi: 10.1016/j.ijpsycho.2009.09.013. Epub 2009 Oct 9.
Frequency tagging has been often used to study intramodal attention but not intermodal attention. We used EEG and simultaneous frequency tagging of auditory and visual sources to study intermodal focused and divided attention in detection and discrimination performance. Divided-attention costs were smaller, but still significant, in detection than in discrimination. The auditory steady-state response (SSR) showed no effects of attention at frontocentral locations, but did so at occipital locations where it was evident only when attention was divided between audition and vision. Similarly, the visual SSR at occipital locations was substantially enhanced when attention was divided across modalities. Both effects were equally present in detection and discrimination. We suggest that both effects reflect a common cause: An attention-dependent influence of auditory information processing on early cortical stages of visual information processing, mediated by enhanced effective connectivity between the two modalities under conditions of divided attention.
频率标记法常用于研究单模态注意，但不适用于多模态注意。我们使用 EEG 和听觉与视觉源的同时频率标记来研究检测和辨别任务中的多模态集中注意和分散注意。在检测中，分散注意的代价较小，但仍有显著差异，而在辨别中则没有显著差异。在额中央位置，听觉稳态反应 (SSR) 没有注意的影响，但在枕部位置有影响，只有当注意在听觉和视觉之间分散时才明显。同样，当注意力在模态之间分散时，视觉 SSR 在枕部位置得到了显著增强。这两种效应在检测和辨别中都同样存在。我们认为这两种效应都反映了一个共同的原因：听觉信息处理对视觉信息处理早期皮层阶段的注意力依赖影响，这种影响是通过在分散注意力条件下两种模态之间增强的有效连通性介导的。
