Department of Psychology and the Institute of Information Processing and Decision Making (IIPDM), University of Haifa, Israel.
Department of Psychology and the Institute of Information Processing and Decision Making (IIPDM), University of Haifa, Israel.
Cognition. 2021 Jan;206:104476. doi: 10.1016/j.cognition.2020.104476. Epub 2020 Nov 10.
The present study examined the involvement of subcortical structures in the processing of global and local information. To this end, we used a stereoscope to present hierarchical stimuli (global shapes composed of local elements) in a dichoptic or a monocular fashion, such that global and local information was either presented to the same eye (same-eye condition) or segregated between the eyes (different-eyes condition). In Experiment 1, the typical global advantage and global-to-local interference were observed for the same-eye presentation condition. On the other hand, no indication of a global advantage or of global-to-local interference emerged in the different-eyes presentation condition. In Experiment 2 we replicated these results, ruling out a possible alternative explanation that the pattern of results observed for the different-eyes presentation condition resulted merely from segregation of the stimulus between the eyes. Rather, the experiment demonstrated that the global-to-local interference was eliminated only when global and local information was segregated between the eyes. Taken together, these findings suggest that processing the global aspect of hierarchical stimuli involves subcortical regions indexed by monocular portions of the visual system.
本研究探讨了皮质下结构在处理全局和局部信息中的作用。为此，我们使用立体镜以双眼或单眼的方式呈现层次化刺激（由局部元素组成的全局形状），使得全局和局部信息要么呈现给同一只眼睛（同眼条件），要么在两只眼睛之间分离（异眼条件）。在实验 1 中，对于同眼呈现条件，观察到了典型的全局优势和全局到局部的干扰。另一方面，在异眼呈现条件下，没有出现全局优势或全局到局部干扰的迹象。在实验 2 中，我们复制了这些结果，排除了一种可能的替代解释，即异眼呈现条件下观察到的结果模式仅仅是由于刺激在两只眼睛之间的分离。相反，实验表明，只有当全局和局部信息在两只眼睛之间分离时，全局到局部的干扰才会消除。总之，这些发现表明，处理层次化刺激的全局方面涉及由视觉系统的单眼部分索引的皮质下区域。
