Eye movement-invariant representations in the human visual system.
Eye movement-invariant representations in the human visual system.
复制标题
人类视觉系统中的眼动不变表示。
DOI：
10.1167/17.1.11
复制
发表时间：
2017-01-01
影响因子：
1.8
通讯作者：
Gallant JL
中科院分区：
文献类型：
--
作者：
Nishimoto S;Huth AG;Bilenko NY;Gallant JL
在自然视觉期间，人类频繁地进行眼球运动，但感知到稳定的视觉世界。因此，人类视觉系统可能包含对眼睛运动不变的视觉世界的表示。在这里，我们提出了一个实验，旨在确定视觉区域，可能包含眼睛运动不变的表示。我们使用功能性MRI记录了四名观看自然电影的人类受试者的大脑活动。在一种情况下，受试者被要求稳定地注视，而在另一种情况下，他们被允许自由地进行自愿的眼球运动。在每种情况下使用的电影是相同的。我们推断，在固定和自由观看条件下，在不随眼球运动而变化的视觉区域记录的大脑活动应该是相似的。相反，对眼球运动敏感的视觉区域的活动在注视和自由观看之间应该是不同的。因此，我们测量了在固定条件下重复呈现相同电影的大脑活动的相似性，并分别在固定和自由观看条件之间进行测量。这些措施的比率被用来确定哪些大脑区域最有可能包含眼睛运动不变的表示。我们发现，位于早期视觉区的体素强烈的眼球运动的影响，而腹侧颞区的体素只有微弱的眼球运动的影响。这些结果表明，腹侧颞视觉区包含一个稳定的视觉世界，是不变的眼睛运动过程中自然的视觉。
During natural vision, humans make frequent eye movements but perceive a stable visual world. It is therefore likely that the human visual system contains representations of the visual world that are invariant to eye movements. Here we present an experiment designed to identify visual areas that might contain eye-movement-invariant representations. We used functional MRI to record brain activity from four human subjects who watched natural movies. In one condition subjects were required to fixate steadily, and in the other they were allowed to freely make voluntary eye movements. The movies used in each condition were identical. We reasoned that the brain activity recorded in a visual area that is invariant to eye movement should be similar under fixation and free viewing conditions. In contrast, activity in a visual area that is sensitive to eye movement should differ between fixation and free viewing. We therefore measured the similarity of brain activity across repeated presentations of the same movie within the fixation condition, and separately between the fixation and free viewing conditions. The ratio of these measures was used to determine which brain areas are most likely to contain eye movement-invariant representations. We found that voxels located in early visual areas are strongly affected by eye movements, while voxels in ventral temporal areas are only weakly affected by eye movements. These results suggest that the ventral temporal visual areas contain a stable representation of the visual world that is invariant to eye movements made during natural vision.