Auditory and visual attention modulate motion processing in area MT+
Auditory and visual attention modulate motion processing in area MT+
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DOI：
10.1016/s0926-6410(02)00061-7
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发表时间：
2002-06-01
期刊：
影响因子：
--
通讯作者：
Colby, CL
中科院分区：
文献类型：
--
作者：
Berman, RA;Colby, CL
行为和生理学研究已经证实，对给定特征或位置的视觉注意可以调节早期的视觉加工。在目前的实验中，我们询问听觉注意是否同样可以影响视觉处理。我们使用视觉错觉运动后效应(MAE)来评估视觉和听觉注意对人体MT+区运动加工的影响。我们获得了心理物理和功能磁共振成像(FMRI)数据，同时受试者在交替的区块中注视和观看运动和静止的刺激。对于四种运动条件，我们测量了随后的MAE持续时间，运动适应后MT+活动恢复到基线的时间(衰减时间)，以及运动适应过程中MT+活动的大小。对于每个受试者，我们首先通过比较反转和扩展的运动条件，获得了在没有注意要求的情况下的运动加工测量。受试者在适应扩张运动后感觉到MAE，而不是先前观察到的反转运动，而MT+的衰减时间在扩张运动后选择性地延长。然后，我们评估了在扩展运动适应过程中执行视觉或听觉注意任务的效果。注意任务的执行，无论是视觉的还是听觉的，在MT中产生了随后的MAE知觉和相关的衰减时间的显著减少，与仅有注视的扩大运动相比。这两种注意力任务也降低了运动适应过程中的激活程度。这些数据表明，听觉注意和视觉注意一样，可以在视觉层次结构的非常早期阶段改变感觉处理。(C)2002 Elsevier Science B.V.保留所有权利。
Behavioral and physiological studies have established that visual attention to a given feature or location can modulate early visual processing. In the present experiment, we asked whether auditory attention can likewise influence visual processing. We used a visual illusion, the motion aftereffect (MAE), to assess the effects of visual and auditory attention on motion processing in human area MT+. We acquired psychophysical and functional magnetic resonance imaging (fMRI) data while subjects fixated and viewed moving and stationary stimuli in alternating blocks. For each of four motion conditions, we measured the duration of die subsequent MAE, the time for activity in MT+ to return to baseline after motion adaptation (decay time), and the magnitude of MT+ activity during motion adaptation. For each subject, we first obtained measures of motion processing in the absence of attentional demands, by comparing reversing and expanding motion conditions. Subjects perceived the MAE following adaptation to expanding but not reversing motion, as observed previously, and decay times in MT+ were selectively prolonged after expanding motion. We then assessed the effects of performing either a visual or an auditory attentional task during expanding motion adaptation. Performance of the attentional task, whether visual or auditory, produced a significant reduction of subsequent MAE perception and associated decay times in MT, as compared to expanding motion with fixation only. Both attentional tasks also reduced the magnitude of activation during motion adaptation. These data show that auditory attention, like visual attention, can modify sensory processing at a remarkably early stage of the visual hierarchy. (C) 2002 Elsevier Science B.V. All rights reserved.