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视网膜皮层编码的Ternus-Pikler展示了早期视觉区的反应

Thunell E, van der Zwaag W, ?gmen H, et al.

期刊名称:J Vis

卷期:2016年第16卷第3期

摘要

对外部世界的视觉再现常常被假定是视网膜皮层的,并且很多大脑视觉区域确实是以视网膜皮层组织的。然而,视觉不是基于一个位于视网膜皮层坐标的参照系。比如说,当一个物体移动,其组成部分的移动是相对于物体被感知,而不是在视网膜皮层坐标中。因此,移动的物体作为一个计算其组成部分特性的非视网膜皮层参照系。我们现在对于大脑是如何完成这一壮举仍有很多不知道的地方。在此,我们使用Ternus-Pikler显示,以研究一个移动物体,在一个稳定参照系中视网膜皮层过程,相对于非视网膜皮层过程。使用7TfMRI,我们发现在V1V2V3平均血氧含量依赖激活反映了视网膜皮层特性,但是不是非视网膜皮层知觉,Ternus-Pikler显示的。在人类运动处理复合体(human motion processing complex, hMT+)中,激活是兼容了视网膜皮层和非视网膜皮层编码的。因此,hMT+可能是第一个编码Ternus-Pikler显示的非视网膜皮层知觉的视觉区域。

The visual representation of the world is often assumed to be retinotopic, and many visual brain areas are indeed organized retinotopically. Visual perception, however, is not based on a reference frame anchored in retinotopic coordinates. For example, when an object moves, motion of its constituent parts is perceived relative to the object rather than in retinotopic coordinates. The moving object thus serves as a nonretinotopic reference system for computing the properties of its parts. It is largely unknown how the brain accomplishes this feat. Here, we used the Ternus-Pikler display to pit retinotopic processing in a stationary reference system against nonretinotopic processing in a moving one. Using 7T fMRI, we found that the average blood-oxygen-level dependent activations in V1, V2, and V3 reflected the retinotopic properties, but not the nonretinotopic percepts, of the Ternus-Pikler display. In the human motion processing complex (hMT+), activations were compatible with both retinotopic and nonretinotopic encoding. Thus, hMT+ may be the first visual area encoding the nonretinotopic percepts of the Ternus-Pikler display.


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