Directional anisotropies reveal a functional segregation of visual motion processing for perception and action
Directional anisotropies reveal a functional segregation of visual motion processing for perception and action
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DOI：
10.1016/s0896-6273(03)00145-4
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发表时间：
2003-03-27
期刊：
影响因子：
16.2
通讯作者：
Lisberger, SG
中科院分区：
文献类型：
--
作者：
Churchland, AK;Gardner, JL;Lisberger, SG
人类在方向感知上表现出各向异性：当运动围绕水平或垂直轴而不是对角线轴时，辨别能力更强。与知觉中一致的方向各向异性相反，我们发现在平滑的眼球运动中只有小的特殊各向异性，这是一种需要准确辨别视觉运动方向的运动动作。追求和感知方向辨别都依赖于来自中颞叶视觉区（MT）的信号，然而对猕猴中颞叶视觉区神经元反应的多种测量分析未能提供方向各向异性的证据。我们得出结论，MT均匀地表示不同的运动方向，随后的处理在感知路径中产生了独特的方向各向异性。我们的数据支持这样的假设，至少对于视觉运动，感知和行动是由来自不同感觉流的输入引导的。感知的方向各向异性似乎是在两股水流从MT区分离后产生的。
Humans exhibit an anisotropy in direction perception: discrimination is superior when motion is around horizontal or vertical rather than diagonal axes. In contrast to the consistent directional anisotropy in perception, we found only small idiosyncratic anisotropies in smooth pursuit eye movements, a motor action requiring accurate discrimination of visual motion direction. Both pursuit and perceptual direction discrimination rely on signals from the middle temporal visual area (MT), yet analysis of multiple measures of MT neuronal responses in the macaque failed to provide evidence of a directional anisotropy. We conclude that MT represents different motion directions uniformly, and subsequent processing creates a directional anisotropy in pathways unique to perception. Our data support the hypothesis that, at least for visual motion, perception and action are guided by inputs from separate sensory streams. The directional anisotropy of perception appears to originate after the two streams have segregated and downstream from area MT.