The large-scale organization of shape processing in the ventral and dorsal pathways: Subject 160310120847_Experiment 1

160310120847 nii files. Part of a dataset from the paper entitled : The large-scale organization of shape processing in the ventral and dorsal pathways by Freud, Culham, Plaut and Behrmann. See - https://doi.org/10.1184/R1/c.3889873.v1. For each participant 8 functional runs and one anatomical run are included.<br>Abstract:Although shape perception is considered a function of the ventral visual pathway, evidence suggests that the dorsal pathway also derives shape-based representations. In two psychophysics and neuroimaging experiments, we characterized the response properties, topographical organization and perceptual relevance of these representations. In both pathways, shape sensitivity increased from early visual cortex to extrastriate cortex but then decreased in anterior regions. Moreover, the lateral aspect of the ventral pathway and posterior regions of the dorsal pathway were sensitive to the availability of fundamental shape properties, even for unrecognizable images. This apparent representational similarity between the posterior-dorsal and lateral-ventral regions was corroborated by a multivariate analysis. Finally, as with ventral pathway, the activation profile of posterior dorsal regions was correlated with recognition performance, suggesting a possible contribution to perception. These findings challenge a strict functional dichotomy between the pathways and suggest a more distributed model of shape processing.

本数据集包含160310120847个nii格式文件（NIfTI files），为Freud、Culham、Plaut与Behrmann发表的题为"腹侧与背侧通路中形状加工的大规模组织机制"的论文所使用数据集的一部分。详见：https://doi.org/10.1184/R1/c.3889873.v1。每位被试均包含8次功能扫描序列（functional run）与1次结构扫描序列（anatomical run）。

**摘要**：尽管学界普遍认为形状知觉属于腹侧视觉通路的功能范畴，但现有证据表明背侧通路同样可提取基于形状的表征。本研究通过两项心理物理学与神经影像学实验，系统刻画了这类表征的响应特性、拓扑组织模式及其与知觉加工的相关性。在两条通路中，形状敏感性均随皮层层级从早期视觉皮层延伸至纹外皮层时逐步升高，但在前部区域出现下降。此外，即便针对无法识别的图像，腹侧通路的外侧区域与背侧通路的后部区域仍对基础形状属性的可获得性具有敏感性。多变量分析结果证实了背侧后部与腹侧外侧区域之间存在的表观表征相似性。最后，与腹侧通路一致，背侧后部区域的激活模式与识别绩效显著相关，提示其可能对知觉过程存在贡献。上述研究结果挑战了两条通路间严格的功能二分观点，并为形状加工的分布式模型提供了实证支持。