Neural representations of graspable objects: are tools special?
Neural representations of graspable objects: are tools special?
复制标题
DOI：
10.1016/j.cogbrainres.2004.10.006
复制
发表时间：
2005-03-01
期刊：
影响因子：
--
通讯作者：
Lee, JN
中科院分区：
文献类型：
--
作者：
Creem-Regehr, SH;Lee, JN
最近的认知和神经影像学研究已经研究了工具背景下感知和动作之间的关系。这些研究表明，即使在一项任务中不需要明显的行动，工具也会“增强”行动。工具是独特的对象，因为它们有一个视觉结构，提供行动，也有一个特定的功能标识。目前的研究调查的程度，一个工具的代表行动是绑在它的可抓握性或其功能的使用。功能性磁共振成像（fMRI）被用来检查与不同类别的可抓握物体相关的运动表征。参与者观看并想象抓握带有手柄或中性可抓握形状的3D工具的图像。在观看任务中，运动相关区域的皮质（后颞中回，腹侧运动前区，后顶叶）与工具相比，形状。在想象的抓取任务中，两种类型的物体都出现了额顶叶颞叶激活网络。然而，差异被发现在运动前区和顶叶激活的程度和位置，并在颞中回和梭状回的工具相比，形状的额外激活。我们认为，可抓握物体的功能特性影响与它们相关的运动表征的程度。这些结果对理解视觉处理系统中“什么”和“如何”之间的相互作用具有重要意义。(c)2004 Elsevier B.V.保留所有权利。
Recent cognitive and neuroimaging studies have examined the relationship between perception and action in the context of tools. These studies suggest that tools "potentiate" actions even when overt actions are not required in a task. Tools are unique objects because they have a visual structure that affords action and also a specific functional identity. The present studies investigated the extent to which a tool's representation for action is tied to its graspability or its functional use. Functional magnetic resonance imaging (fMRI) was used to examine the motor representations associated with different classes of graspable objects. Participants viewed and imagined grasping images of 3D tools with handles or neutral graspable shapes. During the viewing task, motor-related regions of cortex (posterior middle temporal gyrus, ventral premotor, and posterior parietal) were associated with tools compared to shapes. During the imagined grasping task, a frontal-parietal-temporal network of activation was seen with both types of objects. However, differences were found in the extent and location of premotor and parietal activation, and additional activation in the middle temporal gyrus and fusiform gyrus for tools compared to shapes. We suggest that the functional identity of graspable objects influences the extent of motor representations associated with them. These results have implications for understanding the interactions between "what" and "how" visual processing systems. (c) 2004 Elsevier B.V. All rights reserved.