The large-scale organization of shape processing in the ventral and dorsal pathways: Subject 160224122535_Experiment 1

subject 160224122535 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.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.

本数据集涉及160224122535号主题，为Freud、Culham、Plaut及Behrmann所著论文《腹侧与背侧通路中形状处理的大规模组织》的一部分（见：https://doi.org/10.1184/R1/c.3889873.v1）。针对每位参与者，包含8次功能扫描和1次解剖扫描。摘要：尽管形状感知被视为腹侧视觉通路的功能，但有证据表明背侧通路亦能形成基于形状的表征。在两项心理物理学与神经影像学实验中，我们描述了这些表征的响应特性、拓扑组织和感知相关性。在两条通路中，形状敏感性从早期视觉皮层至额外纹状皮层逐渐增强，但在前部区域有所下降。此外，腹侧通路的外侧和背侧通路的后部区域对基本形状属性的可获得性敏感，即便对于难以辨认的图像亦然。后背侧区域与外侧腹侧区域之间的这种表征相似性，经多元分析得到证实。最后，与腹侧通路相似，后背侧区域的激活模式与识别性能相关联，暗示其对感知可能有所贡献。这些发现挑战了通路间的严格功能二分法，并提出了形状处理更为分散化的模型。