Behaviorally Relevant Abstract Object Identity Representation in the Human Parietal Cortex
Behaviorally Relevant Abstract Object Identity Representation in the Human Parietal Cortex
复制标题
DOI：
10.1523/jneurosci.1016-15.2016
复制
发表时间：
2016-02-03
影响因子：
5.3
通讯作者：
Xu, Yaoda
中科院分区：
文献类型：
--
作者：
Jeong, Su Keun;Xu, Yaoda
物体身份的表征是人类视觉的基础。使用功能磁共振成像和多体素模式分析，在这里，我们报告的高度抽象的对象身份信息在人类顶叶皮层的代表。具体来说，在上级顶内沟（IPS），一个区域以前被证明跟踪视觉短期记忆能力，我们发现对象身份表示著名的面孔自由变化的观点，发型，面部表情，和年龄;和众所周知的汽车嵌入在不同的场景，并显示从不同的观点和大小。至关重要的是，这些顶叶身份表征的行为相关，因为他们密切跟踪的行为任务中获得的感知脸身份的相似性。同时，前额叶和顶叶皮层（不包括上级IPS）的任务激活区没有表现出这种抽象的物体身份表征。与以前的研究不同，我们也未能观察到后腹侧和侧视觉对象处理区域的身份表征，这可能是由于我们在这里的刺激操作需要更多的身份抽象。我们的MRI切片覆盖范围使我们无法检查前颞叶的身份表征，这是腹侧区域计算身份信息的可能区域。总的来说，我们表明，人类顶叶皮层，背视觉处理通路的一部分，是能够举行抽象和复杂的视觉表示，行为相关。这些结果反对顶叶皮层在注意力中的作用的“内容贫乏”观点。相反，人类顶叶皮层似乎是“内容丰富的”，能够直接参与大脑中目标驱动的视觉信息表征。
The representation of object identity is fundamental to human vision. Using fMRI and multivoxel pattern analysis, here we report the representation of highly abstract object identity information in human parietal cortex. Specifically, in superior intraparietal sulcus (IPS), a region previously shown to track visual short-term memory capacity, we found object identity representations for famous faces varying freely in viewpoint, hairstyle, facial expression, and age; and for well known cars embedded in different scenes, and shown from different viewpoints and sizes. Critically, these parietal identity representations were behaviorally relevant as they closely tracked the perceived face-identity similarity obtained in a behavioral task. Meanwhile, the task-activated regions in prefrontal and parietal cortices (excluding superior IPS) did not exhibit such abstract object identity representations. Unlike previous studies, we also failed to observe identity representations in posterior ventral and lateral visual object-processing regions, likely due to the greater amount of identity abstraction demanded by our stimulus manipulation here. Our MRI slice coverage precluded us from examining identity representation in anterior temporal lobe, a likely region for the computing of identity information in the ventral region. Overall, we show that human parietal cortex, part of the dorsal visual processing pathway, is capable of holding abstract and complex visual representations that are behaviorally relevant. These results argue against a "content-poor" view of the role of parietal cortex in attention. Instead, the human parietal cortex seems to be "content rich" and capable of directly participating in goal-driven visual information representation in the brain.