The large-scale organization of shape processing in the ventral and dorsal pathways: Subject 160301110546_Experiment 1

subject 160301110546 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.

主题编号160301110546，NII格式文件。该数据集摘自Freud、Culham、Plaut及Behrmann合著的论文《腹侧和背侧通路中形状处理的大规模组织》，详见 - https://doi.org/10.1184/R1/c.3889873.v1。对于每位参与者，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，但证据表明背侧通路亦能产生基于形状的表征。在两项心理物理学和神经影像学实验中，我们描绘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，但在前部区域则有所下降。此外，腹侧通路的侧翼和背侧通路的后部区域对基本形状属性的可获得性敏感，即使对于难以辨认的图像也是如此。后背侧区域与侧腹侧区域之间这种明显的表征相似性，经多变量分析得到证实。最后，与腹侧通路类似，后背侧区域的激活模式与识别性能相关，暗示其可能对感知有所贡献。这些发现挑战了通路间严格的功能二分法，并提出了形状处理更为分布式模型的可能性。