The limited contribution of early visual cortex in visual working memory for surface roughness
The limited contribution of early visual cortex in visual working memory for surface roughness
复制标题
早期视觉皮层在视觉工作记忆中对表面粗糙度的贡献有限
DOI：
10.1007/s00221-020-05881-0
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发表时间：
2020
影响因子：
2
通讯作者：
Saiki Jun
中科院分区：
文献类型：
--
作者：
Fujimichi Munendo;Yamamoto Hiroki;Saiki Jun
人类早期视皮层中的视觉表征对视觉工作记忆（VWM）是必要的吗？以前的研究表明，VWM是由几个大脑区域的分布式表征支撑的，包括早期视觉皮层。值得注意的是，在这些研究中，参与者必须在一致的视觉条件下记住图像。然而，在我们的日常生活中，我们必须保持物体的基本视觉特性，无论照明或视角如何变化。在这些情况下，大脑区域尤其是早期视觉皮层的作用仍然不清楚。本研究探讨是否早期视觉皮层是必不可少的，以实现稳定的VWM。专注于VWM的对象表面特性，我们进行了功能磁共振成像实验，而男性和女性参与者进行了延迟粗糙度歧视的任务，在不同的照明下提出的样品和探针领域。通过对感兴趣区域的脑活动进行多体素模式分析，我们发现腹侧视皮层和顶内沟在变化的光照条件下参与了粗糙度VWM。相反，VWM并没有得到早期视觉皮层的有力支持。这些研究结果表明，在早期的视觉皮层单独的视觉表示是不够的强大的粗糙度VWM表示在光照变化过程中所需的。
Are visual representations in the human early visual cortex necessary for visual working memory (VWM)? Previous studies suggest that VWM is underpinned by distributed representations across several brain regions, including the early visual cortex. Notably, in these studies, participants had to memorize images under consistent visual conditions. However, in our daily lives, we must retain the essential visual properties of objects despite changes in illumination or viewpoint. The role of brain regions—particularly the early visual cortices—in these situations remains unclear. The present study investigated whether the early visual cortex was essential for achieving stable VWM. Focusing on VWM for object surface properties, we conducted fMRI experiments, while male and female participants performed a delayed roughness discrimination task in which sample and probe spheres were presented under varying illumination. By applying multi-voxel pattern analysis to brain activity in regions of interest, we found that the ventral visual cortex and intraparietal sulcus were involved in roughness VWM under changing illumination conditions. In contrast, VWM was not supported as robustly by the early visual cortex. These findings show that visual representations in the early visual cortex alone are insufficient for the robust roughness VWM representation required during changes in illumination.