Task Context Overrules Object- and Category-Related Representational Content in the Human Parietal Cortex.
Task Context Overrules Object- and Category-Related Representational Content in the Human Parietal Cortex.
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DOI：
10.1093/cercor/bhw419
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发表时间：
2017-01-01
期刊：
影响因子：
--
通讯作者：
Op de Beeck H
中科院分区：
文献类型：
--
作者：
Bracci S;Daniels N;Op de Beeck H
当看到物体时，背顶叶视觉流被激活，但顶叶物体表征的确切性质仍在讨论中。在这里，我们测试两个具体的假设。首先，顶叶皮层偏向于某些表征，而不是其他表征，与腹侧区域相比具有不同的偏向。一个主要的例子是对象动作表征。第二，顶叶皮层与额区形成了一个通用的多需求网络，表现出与额区相似的任务效应和表征内容。为了区分这些假设，我们实施了人类神经影像学研究的刺激集，解离相关的对象动作从对象类别，同时操纵任务上下文是动作或类别相关。顶叶和前额叶区域的表征代表任务相关的对象属性（动作任务中的动作表征），没有无关对象属性（动作任务中的类别表征）的迹象。相反，不相关的对象属性表示在腹侧区域。这些研究结果强调，人类顶叶皮层不优先代表特定的对象属性，无论任务，但连同额叶区是一个多需求和内容丰富的皮质网络的一部分，代表任务相关的对象属性。
The dorsal, parietal visual stream is activated when seeing objects, but the exact nature of parietal object representations is still under discussion. Here we test 2 specific hypotheses. First, parietal cortex is biased to host some representations more than others, with a different bias compared with ventral areas. A prime example would be object action representations. Second, parietal cortex forms a general multiple-demand network with frontal areas, showing similar task effects and representational content compared with frontal areas. To differentiate between these hypotheses, we implemented a human neuroimaging study with a stimulus set that dissociates associated object action from object category while manipulating task context to be either action- or category-related. Representations in parietal as well as prefrontal areas represented task-relevant object properties (action representations in the action task), with no sign of the irrelevant object property (category representations in the action task). In contrast, irrelevant object properties were represented in ventral areas. These findings emphasize that human parietal cortex does not preferentially represent particular object properties irrespective of task, but together with frontal areas is part of a multiple-demand and content-rich cortical network representing task-relevant object properties.
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DOI：
10.1126/science.1194908
发表时间：
2010-11-05
期刊：
Science (New York, N.Y.)
影响因子：
--
作者：
Freiwald WA;Tsao DY
通讯作者：
Tsao DY
影响因子：
3.6
作者：
Kemmerer, David;Rudrauf, David;Manzel, Ken;Tranel, Daniel
通讯作者：
Tranel, Daniel
影响因子：
14.5
作者：
Kalenine, Solene;Buxbaum, Laurel J.;Coslett, Harry Branch
通讯作者：
Coslett, Harry Branch
DOI：
10.1073/pnas.88.5.1621
发表时间：
1991-03-01
影响因子：
11.1
作者：
HAXBY, JV;GRADY, CL;RAPOPORT, SI
通讯作者：
RAPOPORT, SI
DOI：
10.1073/pnas.1312567111
发表时间：
2014-03-11
影响因子：
11.1
作者：
Harel, Assaf;Kravitz, Dwight J.;Baker, Chris I.
通讯作者：
Baker, Chris I.