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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Object Representations in Human Visual Cortex Formed Through Temporal Integration of Dynamic Partial Shape Views
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Object Representations in Human Visual Cortex Formed Through Temporal Integration of Dynamic Partial Shape Views

机译：通过动态部分形状视图的时间集成来形成人类视觉皮层的对象表示

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摘要

We typically recognize visual objects using the spatial layout of their parts, which are present simultaneously on the retina. Therefore, shape extraction is based on integration of the relevant retinal information over space. The lateral occipital complex (LOC) can represent shape faithfully in such conditions. However, integration over time is sometimes required to determine object shape. To study shape extraction through temporal integration of successive partial shape views, we presented human participants (bothmenand women) with artificial shapes that moved behind a narrow vertical or horizontal slit. Only a tiny fraction of the shape was visible at any instant at the same retinal location. However, observers perceived a coherent whole shape instead of a jumbled pattern. Using fMRI and multivoxel pattern analysis, we searched for brain regions that encode temporally integrated shape identity. We further required that the representation of shape should be invariant to changes in the slit orientation. We show that slit-invariant shape information is most accurate in the LOC. Importantly, the slit-invariant shape representations matched the conventional whole-shape representations assessed during full-image runs. Moreover, when the same slit-dependent shape slivers were shuffled, thereby preventing their spatiotemporal integration, slit-invariant shape information was reduced dramatically. The slit-invariant representation of the various shapes also mirrored the structure of shape perceptual space as assessed by perceptual similarity judgment tests. Therefore, the LOC is likely to mediate temporal integration of slit-dependent shape views, generating a slit-invariant whole-shape percept. These findings provide strong evidence for a global encoding of shape in the LOC regardless of integration processes required to generate the shape percept.
机译：我们通常使用其部分的空间布局来识别视觉物体，这些空间布局在视网膜上同时存在。因此，形状提取基于相关视网膜信息在空间上的集成。横向枕骨复合物（LOC）可以忠实地表示在这种条件下的形状。但是，有时需要随时间的集成来确定对象形状。为了通过连续的部分形状视图的时间集成来研究形状提取，我们向人工形状提出了人工的人工（佩戴妇女），这些形状在狭窄的垂直或水平狭缝后面移动。在同一视网膜位置的任何速度下只能看到形状的微小部分。然而，观察者感知一个连贯的整个形状而不是混乱的图案。使用FMRI和多种式模式分析，我们搜索了编码时间上整合形状标识的大脑区域。我们进一步要求，形状的表示应该是不变的，以改变狭缝方向。我们显示狭缝不变形状信息在LOC中最准确。重要的是，狭缝不变的形状表示与在全图像运行期间评估的传统的全形表示匹配。此外，当与相同的狭缝依赖性形状的条子进行洗牌时，从而防止它们的时空积分，狭缝不变形状信息显着降低。各种形状的狭缝不变表示也使形状感知空间的结构反映了通过感知相似性判断测试评估的形状感知空间。因此，LOC可能介导狭缝依赖性形状视图的时间集成，产生狭缝不变的全形录制。这些调查结果提供了强大的证据，该证据是LOC中的全局编码，无论生成形状录制所需的集成过程如何。

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