Global object shape representations in the primate brain.
Global object shape representations in the primate brain.
复制标题
灵长类大脑中的全局物体形状表征。
DOI：
10.1016/j.tics.2022.11.004
复制
发表时间：
2023
影响因子：
19.9
通讯作者：
Xu,Yaoda
中科院分区：
文献类型：
--
作者：
Xu,Yaoda
Ayzenberg和Behrmann [1]最近在TiCS中提出，全局对象形状可能不由灵长类动物腹侧通路表示，而是可以由背侧通路中的后顶叶皮层（PPC）计算和表示。Ayzenberg和Behrmann将全局对象形状定义为“以对象为中心的表示，通过局部特征的空间排列或结构描述来描述对象的整体形式，同时保持对特征本身之间的变化的宽容”。Ayzenberg和Behrmann [1]的假设是有趣的，并挑战了长期以来的信念，即物体表征，包括全局形状表征，首先在灵长类动物腹侧通路中计算。Ayzenberg和Behrmann根据最近对猴子神经生理学和人类功能磁共振成像研究的几项实验发现提出了他们的建议。在一项研究中，虽然小的图像扰动保持了对象身份的完整性，但却引起了单个猕猴IT神经元的大响应[2]。因此，IT神经元对局部图像特征敏感，但这并不排除全局对象形状也由IT神经元表示的可能性。当物体图像被打乱以保持其视觉统计数据时，对图像特征的敏感性也见于人类腹侧视觉皮层，但在其他方面无法识别[3]。同样，对图像特征和全局形状的敏感性可以在人类腹侧皮层中共存。显示前者的证据并不意味着缺乏后者的证据。
Ayzenberg and Behrmann [1] recently proposed in TiCS that global object shape may not be represented by the primate ventral pathway, but may instead be computed and represented by the posterior parietal cortex (PPC) in the dorsal pathway. Ayzenberg and Behrmann defined global object shape as ‘an object-centered representation that describes the overall form of the object via the spatial arrangement, or structural description, of local features while remaining tolerant to variations among the features themselves’. They described global shape representation as an essential part of transformation-tolerant object representation, which enables object recognition under different viewing conditions.Ayzenberg and Behrmann’s [1] hypothesis is intriguing and challenges the long-held belief that object representation, including global shape representation, is first computed in the primate ventral pathway. Ayzenberg and Behrmann formulated their proposal based on several recent experimental findings from monkey neurophysiological and human fMRI studies. In one study, small image perturbations that left the object identity intact nevertheless evoked large responses from individual macaque IT neurons [2]. Thus, IT neurons are sensitive to local image features, but this does not exclude the possibility that global object shape is also represented by IT neurons. Sensitivity to image features is also seen in the human ventral visual cortex when object images are scrambled to maintain their visual statistics but are otherwise unrecognizable [3]. Again, sensitivity to image features and global shapes could coexist in the human ventral cortex. Showing evidence of the former need not imply a lack of evidence of the latter.
登录
查看更多内容
影响因子：
2.5
作者：
MAUNSELL, JHR;VANESSEN, DC
通讯作者：
VANESSEN, DC
恒河猴前纹状皮层的第三视觉复合体。
DOI：
10.1113/jphysiol.1978.sp012271
发表时间：
1978
期刊：
The Journal of Physiology
影响因子：
--
作者：
S. Zeki
通讯作者：
S. Zeki
影响因子：
2.5
作者：
Masayuki Watanabe;Hiroki Tanaka;T. Uka;I. Fujita
通讯作者：
Masayuki Watanabe;Hiroki Tanaka;T. Uka;I. Fujita
影响因子：
2.5
作者：
Nakamura, K;Colby, CL
通讯作者：
Colby, CL
影响因子：
2.5
作者：
GNADT, JW;MAYS, LE
通讯作者：
MAYS, LE