Spatial modulation of primate inferotemporal responses by eye position.

Spatial modulation of primate inferotemporal responses by eye position.
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DOI:
10.1371/journal.pone.0003492
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发表时间:
2008
期刊:
影响因子:
3.7
通讯作者:
Sereno, Anne B.
Sereno, Anne B.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lehky, Sidney R.;Peng, Xinmiao;McAdams, Carrie J.;Sereno, Anne B.

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腹侧视觉流中物体识别和场景分析的一个关键方面是空间参考系,无论是以观察者为中心的坐标系,以物体为中心的坐标系还是基于场景的坐标系。从retinocentric空间到其他参考系的坐标变换涉及将神经视觉响应与视网膜外姿势信息相结合。我们研究了这种空间信息是否可用于猕猴的前颞下(AIT)神经元,通过测量眼睛位置对一组简单的2D形状的反应的影响。我们报告,第一次,一个显着的眼睛位置的影响,超过40%的记录神经元与小的注视角度从中央固定的变化。虽然眼睛位置调节反应,但它不会改变形状选择性。这些数据表明,AIT中的空间信息可用于表示非视网膜中心参考系内的对象和场景。更一般地说,AIT中空间信息的可用性对视觉处理中的经典二分法提出了质疑,该二分法将物体形状处理与腹侧结构(如AIT)相关联,但将空间处理置于投射到背侧结构的单独解剖流中。
A key aspect of representations for object recognition and scene analysis in the ventral visual stream is the spatial frame of reference, be it a viewer-centered, object-centered, or scene-based coordinate system. Coordinate transforms from retinocentric space to other reference frames involve combining neural visual responses with extraretinal postural information. We examined whether such spatial information is available to anterior inferotemporal (AIT) neurons in the macaque monkey by measuring the effect of eye position on responses to a set of simple 2D shapes. We report, for the first time, a significant eye position effect in over 40% of recorded neurons with small gaze angle shifts from central fixation. Although eye position modulates responses, it does not change shape selectivity. These data demonstrate that spatial information is available in AIT for the representation of objects and scenes within a non-retinocentric frame of reference. More generally, the availability of spatial information in AIT calls into questions the classic dichotomy in visual processing that associates object shape processing with ventral structures such as AIT but places spatial processing in a separate anatomical stream projecting to dorsal structures.
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