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首页> 外文期刊>Journal of vision >Human V2A: A map of the peripheral visual hemifield with functional connections to scene-selective cortex
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Human V2A: A map of the peripheral visual hemifield with functional connections to scene-selective cortex

机译：人V2A：具有视觉连接到场景选择性皮层的功能连接的周边视觉半场图

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摘要

Humans can recognize a scene in the blink of an eye. This gist-based visual scene perception is thought to be underpinned by specialized visual processing emphasizing the visual periphery at a cortical locus relatively low in the visual processing hierarchy. Using wide-field retinotopic mapping and population receptive field (pRF) modeling, we identified a new visual hemifield map anterior of area V2d and inferior to area V6, which we propose to call area V2A. Based on its location relative to other visual areas, V2A may correspond to area 23V described in nonhuman primates. The pRF analysis revealed unique receptive field properties for V2A: a large (FWHM ～23°) and constant receptive field size across the central ～70° of the visual field. Resting-state fMRI connectivity analysis further suggests that V2A is ideally suited to quickly feed the scene-processing network with information that is not biased towards the center of the visual field. Our findings not only indicate a likely cortical locus for the initial stages of gist-based visual scene perception, but also suggest a reappraisal of the organization of human dorsomedial occipital cortex with a strip of separate hemifield representations anterior to the early visual areas (V1, V2d, and V3d).
机译：人类可以眨眼就能识别场景。这种基于要点的视觉场景感知被认为是通过专门的视觉处理来加强的，该视觉处理强调了视觉处理层次结构中相对较低的皮质轨迹处的视觉外围。使用宽视场视网膜映射和人口感受野（pRF）建模，我们确定了区域V2d之前且区域V6以下的新视觉半场图，我们建议将其称为区域V2A。基于其相对于其他视觉区域的位置，V2A可以对应于非人类灵长类动物中描述的区域23V。 pRF分析显示了V2A的独特感受野特性：大（FWHM〜23°），并且在视野中央〜70°范围内的感受野大小恒定。静止状态fMRI连通性分析进一步表明，V2A非常适合于向场景处理网络快速提供不偏向视场中心的信息。我们的发现不仅表明基于gist的视觉场景感知的初始阶段可能存在皮质位点，而且还提出了对人类背枕枕皮质组织的重新评估，并在早期视觉区域（V1， V2d和V3d）。

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