The effect of visual distractors on visual working memory for surface roughness in the human brain
The effect of visual distractors on visual working memory for surface roughness in the human brain
复制标题
视觉干扰物对人脑表面粗糙度视觉工作记忆的影响
DOI：
10.1016/j.neulet.2021.135805
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发表时间：
2021
影响因子：
2.5
通讯作者：
Saiki Jun
中科院分区：
文献类型：
--
作者：
Fujimichi Munendo;Yamamoto Hiroki;Saiki Jun
研究已证实，物体粗糙度的视觉工作记忆表征对于人类腹侧视觉皮层和顶内沟的光照变化具有鲁棒性，但在记忆维持过程中尚未对抗视觉干扰。因此，本研究使用多体素模式分析（MVPA）研究了维持阶段视觉干扰物对粗糙度相关大脑区域的影响。我们进行了一项功能磁共振成像实验，要求参与者记住随机试验延迟期间出现的球体粗糙度和视觉干扰因素。无论行为表现如何，基于兴趣的 MVPA 区域显示腹侧视觉皮层和顶内沟对粗糙度记忆没有贡献。事后探照灯 MVPA 显示，当没有视觉干扰物出现时，大脑区域的解码性能水平可能与触觉处理有关。相反，当视觉干扰物出现在延迟期时，解码性能超过了腹侧视觉皮层的机会水平。这些结果表明，当在记忆阶段出现视觉干扰物时，视觉和触觉处理都与视觉工作记忆的粗糙度相关，并且模态的权重根据视觉干扰物的存在而变化。
Research has confirmed that the visual working memory representation of objects’ roughness is robust against illumination changes in the human ventral visual cortex and intraparietal sulcus, but not yet against visual distractors during memory maintenance. Thus, this study investigated the effects of visual distractors on roughness-related brain regions during the maintenance phase using multi-voxel pattern analysis (MVPA). We conducted an fMRI experiment in which participants were asked to memorize a sphere’s roughness against visual distractors, presented during the delay period in random trials. Region of interest-based MVPA showed no contribution of the ventral visual cortex and intraparietal sulcus to the roughness memory, regardless of behavioral performance. Post hoc searchlight MVPA revealed an above-chance decoding performance level in the brain regions presumably related to haptic processing when no visual distractors were shown. In contrast, when visual distractors appeared in the delay period, decoding performance exceeded the chance level in the ventral visual cortex. These results suggest that when visual distractors are presented during the memory phase, both visual and haptic processing are related to visual working memory for roughness, and the weighting of modality changes depending on the presence of visual distractors.