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将工具置于聚光灯下:空间注意力调节皮层中的视觉运动反应。

Placing a tool in the spotlight: spatial attention modulates visuomotor responses in cortex.

作者信息

Handy Todd C, Schaich Borg Jana, Turk David J, Tipper Christine M, Grafton Scott T, Gazzaniga Michael S

机构信息

Department of Psychology, University of British Columbia, Vancouver, Canada.

出版信息

Neuroimage. 2005 May 15;26(1):266-76. doi: 10.1016/j.neuroimage.2005.01.029.

Abstract

Visual spatial attention has long been associated with facilitatory effects on visual perception. Here, we report that spatial attention can also modulate implicit visuomotor processing in dorsal regions of human cortex. Participants underwent fMRI scanning while performing a voluntary attentional orienting task that varied the category of a task-irrelevant object in the attended location (tool vs. non-tool). Data were then analyzed as a function of the attended location (left vs. right visual field) and the object category in that location. We found that the fMRI BOLD response in two visuomotor-related regions--the supplementary motor area (SMA) and the left inferior parietal lobule (IPL)--showed an interaction between the location of attention and the location of the tool in the bilateral display. Further, these responses were statistically distinct from those regions in dorsal cortex showing activity modulated only by the tool location or only by the attended location. While the effects of attending non-foveally within the visual field have been well documented in relation to visual perception, our findings support the proposal that voluntary visuospatial attention may also have consequences for the implicit planning of object-directed actions.

摘要

长期以来,视觉空间注意一直与对视觉感知的促进作用相关联。在此,我们报告空间注意还可调节人类皮质背侧区域的内隐视觉运动加工。参与者在进行一项自愿性注意定向任务时接受功能磁共振成像(fMRI)扫描,该任务会改变被注意位置上与任务无关物体的类别(工具与非工具)。然后根据被注意位置(左视野与右视野)以及该位置上的物体类别对数据进行分析。我们发现,在两个与视觉运动相关的区域——辅助运动区(SMA)和左侧顶下小叶(IPL)——中的fMRI血氧水平依赖(BOLD)反应显示出在双侧显示中注意位置与工具位置之间的相互作用。此外,这些反应在统计学上与背侧皮质中仅由工具位置或仅由被注意位置调节活动的那些区域不同。虽然视野内非中央凹处的注意效应在视觉感知方面已有充分记录,但我们的研究结果支持以下观点,即自愿性视觉空间注意可能也会对目标导向动作的内隐计划产生影响。

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