Department of Psychiatry and Behavioral Sciences, University of Minnesota, Minneapolis, MN, United States of America.
Perception in Action Research Centre (PARC), Department of Cognitive Science, Faculty of Human Sciences, Macquarie University, Sydney, NSW, Australia.
PLoS One. 2020 Jan 30;15(1):e0219725. doi: 10.1371/journal.pone.0219725. eCollection 2020.
Evidence from neuroimaging and brain stimulation studies suggest that visual information about objects in the periphery is fed back to foveal retinotopic cortex in a separate representation that is essential for peripheral perception. The characteristics of this phenomenon have important theoretical implications for the role fovea-specific feedback might play in perception. In this work, we employed a recently developed behavioral paradigm to explore whether late disruption to central visual space impaired perception of color. In the first experiment, participants performed a shape discrimination task on colored novel objects in the periphery while fixating centrally. Consistent with the results from previous work, a visual distractor presented at fixation ~100ms after presentation of the peripheral stimuli impaired sensitivity to differences in peripheral shapes more than a visual distractor presented at other stimulus onset asynchronies. In a second experiment, participants performed a color discrimination task on the same colored objects. In a third experiment, we further tested for this foveal distractor effect with stimuli restricted to a low-level feature by using homogenous color patches. These two latter experiments resulted in a similar pattern of behavior: a central distractor presented at the critical stimulus onset asynchrony impaired sensitivity to peripheral color differences, but, importantly, the magnitude of the effect was stronger when peripheral objects contained complex shape information. These results show a behavioral effect consistent with disrupting feedback to the fovea, in line with the foveal feedback suggested by previous neuroimaging studies.
来自神经影像学和脑刺激研究的证据表明，关于外周物体的视觉信息被反馈到中央视网膜区域的一个单独的代表中，这对于外围感知是必不可少的。这一现象的特征对中央反馈在感知中可能发挥的作用具有重要的理论意义。在这项工作中，我们采用了一种新开发的行为范式来探索中央视觉空间的后期干扰是否会损害对颜色的感知。在第一个实验中，参与者在中央注视的同时在外周呈现彩色新颖物体上执行形状辨别任务。与之前的工作结果一致，在呈现外周刺激后约 100ms 呈现注视处的视觉干扰比在其他刺激起始异步呈现时更能损害对周边形状差异的敏感性。在第二个实验中，参与者在外周呈现相同颜色的物体上执行颜色辨别任务。在第三个实验中，我们通过使用同质颜色补丁进一步测试了限制在低水平特征的这种中央干扰效应。后两个实验得出了类似的行为模式：在关键刺激起始异步呈现中央干扰会损害对外围颜色差异的敏感性，但重要的是，当外围物体包含复杂形状信息时，效应的幅度更强。这些结果显示了与干扰中央反馈一致的行为效应，与之前的神经影像学研究中提出的中央反馈一致。
