High-Level Visual Object Representations Are Constrained by Position
High-Level Visual Object Representations Are Constrained by Position
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DOI：
10.1093/cercor/bhq042
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发表时间：
2010-12-01
期刊：
影响因子：
3.7
通讯作者：
Baker, Chris I.
中科院分区：
文献类型：
--
作者：
Kravitz, Dwight J.;Kriegeskorte, Nikolaus;Baker, Chris I.
人们普遍认为高级视觉对象表示是位置无关的（或不变的）。虽然在高级对象选择皮层中存在对位置的敏感性，但位置和对象身份被认为在群体响应中独立编码，使得位置信息在对象之间可用，并且对象信息在位置之间可用。与这种观点相反，我们表明，与行为和神经成像，视觉对象的表征是位置依赖的（绑定到有限的部分视野）。行为上，我们表明，启动一个对象的效果大大降低了任何变化的位置（内或之间的hemifields），表明在不同的位置相同的对象的非重叠表示。此外，使用神经成像，我们表明，对象选择性皮层不仅是高度敏感的对象位置，但也区分对象的能力，根据其响应在不同的位置大大降低，与所观察到的行为和猕猴对象选择性神经元中观察到的感受野特性。因此，即使在人口水平上，对象选择性皮层的响应对象的信息是受位置。我们的结论是，即使是高层次的视觉对象表示是位置相关的。
It is widely assumed that high-level visual object representations are position-independent (or invariant). While there is sensitivity to position in high-level object-selective cortex, position and object identity are thought to be encoded independently in the population response such that position information is available across objects and object information is available across positions. Contrary to this view, we show, with both behavior and neuroimaging, that visual object representations are position-dependent (tied to limited portions of the visual field). Behaviorally, we show that the effect of priming an object was greatly reduced with any change in position (within- or between-hemifields), indicating nonoverlapping representations of the same object across different positions. Furthermore, using neuroimaging, we show that object-selective cortex is not only highly sensitive to object position but also the ability to differentiate objects based on its response is greatly reduced across different positions, consistent with the observed behavior and the receptive field properties observed in macaque object-selective neurons. Thus, even at the population level, the object information available in response of object-selective cortex is constrained by position. We conclude that even high-level visual object representations are position-dependent.