Talsma D, Kok A
Psychonomics Department, University of Amsterdam, The Netherlands.
Psychophysiology. 2001 Sep;38(5):736-51.
The present study focuses on the question of whether inter- and intramodal forms of attention are reflected in activation of the same or different brain areas. ERPs were recorded while subjects were presented a random sequence of visual and auditory stimuli. They were instructed to attend to nonspatial attributes of either auditory or visual stimuli and to detect occasional target stimuli within the attended channel. An occipital selection negativity was found for intramodal attention to visual stimuli. Visual intermodal attention was also manifested in a similar negativity. A symmetrical dipole pair in the medial inferior occipital areas could account for the intramodal effects. Dipole pairs for the intermodal attention effect had a slightly more posterior location compared to the dipole pair for the intramodal effect. Auditory intermodal attention was manifested in an early enhanced negativity overlapping with the N1 and P2 components, which was localized using a symmetrical dipole pair in the lateral auditory cortex. The onset of the intramodal attention effect was somewhat later (around 200 ms), and was reflected in a frontal processing negativity. The present results indicate that intra- and intermodal forms of attention were indeed similar for visual stimuli. Auditory data suggest the involvement of multiple brain areas.
本研究聚焦于跨模态和模态内注意形式是否反映在相同或不同脑区激活这一问题。在向受试者呈现视觉和听觉刺激的随机序列时记录事件相关电位（ERP）。受试者被指示关注听觉或视觉刺激的非空间属性，并在被关注通道内检测偶尔出现的目标刺激。发现对视觉刺激的模态内注意存在枕叶选择负波。视觉跨模态注意也表现为类似的负波。枕叶内侧区域的一对对称偶极子可解释模态内效应。与模态内效应的偶极子对相比，跨模态注意效应的偶极子对位置稍靠后。听觉跨模态注意表现为与N1和P2成分重叠的早期增强负波，使用外侧听觉皮层的一对对称偶极子对其进行定位。模态内注意效应的起始稍晚（约200毫秒），并反映为额叶加工负波。目前的结果表明，视觉刺激的模态内和跨模态注意形式确实相似。听觉数据表明多个脑区参与其中。
