The representation of egomotion in the human brain
The representation of egomotion in the human brain
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DOI：
10.1016/j.cub.2007.12.053
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发表时间：
2008-02-12
期刊：
影响因子：
9.2
通讯作者：
Smith, Andrew T.
中科院分区：
文献类型：
--
作者：
Wall, Matthew B.;Smith, Andrew T.
视觉处理的一个基本功能是确定身体在空间中的位置，并与其他感觉系统一起监测整个身体的运动，或“自我运动”。“自我运动的一个关键线索是光流。例如，通过环境的向前运动在视网膜上产生扩展的流动模式，并且（眼睛固定在中心）前进方向对应于扩展中心[1]。在猕猴中，视觉皮层区MST对光流结构敏感[2，3]，并且已经提出MST在计算航向中具有中心作用[4]。然而，在这里，我们确定了两个领域的人类大脑，代表视觉线索自我运动更直接比MST。这些区域对单一的光流刺激反应强烈，但当刺激被更多的流斑包围时，反应相对迟钝，从而与自我运动不一致。一个是顶内沟前部的VIP区。另一个是一个新的视觉区，我们称之为扣带沟视觉区（CSV）。区域V1-V4和MT对两种类型的血流刺激的反应大致相等。MST具有中间属性，对多个补丁反应良好，但对单个自我运动兼容补丁有适度的偏好。我们认为，MST仅仅是一个中间处理阶段的视觉线索，自我运动，这些线索是更全面的VIP和CSv编码。
An essential function of visual processing is to establish the position of the body in space and, in concert with the other sense systems, to monitor movement of the whole body, or "egomotion." A key cue to egomotion is optic flow. For example, forward motion through the environment generates an expanding pattern of flow on the retina, and (with eyes fixed centrally) the direction of heading corresponds to the center of expansion [1]. In macaques, visual cortical area MST is sensitive to optic-flow structure [2, 3], and it has been suggested that MST has a central role in the computation of heading [4]. However, here we identify two areas of the human brain that represent visual cues to egomotion more directly than does MST. These areas respond strongly to a single optic-flow stimulus but become relatively unresponsive when the stimulus is surrounded with further flow patches and thereby made inconsistent with egomotion. One is putative area VIP in the anterior portion of the intraparietal sulcus. The other is a new visual area, which we refer to as cingulate sulcus visual area (CSv). Areas V1-V4 and MT respond about equally to both types of flow stimulus. MST has intermediate properties, responding well to multiple patches but with a modest preference for a single, egomotion-compatible patch. We suggest that MST is merely an intermediate processing stage for visual cues to egomotion and that such cues are more comprehensively encoded by VIP and CSv.