Reconstruction of target speed for the guidance of pursuit eye movements
Reconstruction of target speed for the guidance of pursuit eye movements
复制标题
DOI：
10.1523/jneurosci.21-09-03196.2001
复制
发表时间：
2001-05-01
影响因子：
5.3
通讯作者：
Lisberger, SG
中科院分区：
文献类型：
--
作者：
Priebe, NJ;Churchland, MM;Lisberger, SG
我们研究了如何从运动选择性细胞的反应中重建物体速度，以产生与视觉运动速度密切相关的行为。从理论上讲，物体的速度可以通过运动选择细胞活跃群体的速度调节或通过视觉空间的皮质地图上激活的移位率来估计。我们测量了由包含两个相互冲突的运动成分的刺激所引起的追踪眼运动：一个局部成分旨在通过特定的速度调节来激发运动选择性细胞，另一个位移成分旨在通过一系列空间感受场来激发细胞。追踪性眼球运动主要受局部运动成分的驱动，仅受视觉空间中目标移位率的影响较小。使用相同刺激的细胞外单单位记录显示，中颞叶视区(MT)细胞的反应主要依赖于局部运动成分，但受位移成分的影响程度与追踪性眼动相同。我们得出的结论是，追踪的启动与基于MT细胞活跃群体的速度调节的目标速度的重建是一致的。
We studied how object speed is reconstructed from the responses of motion-selective cells for the generation of a behavior that is tightly linked to the speed of visual motion. In theory, the speed of an object could be estimated either from the speed tuning of the active population of motion-selective cells or from the rate of displacement of activation across the cortical map of visual space. We measured the pursuit eye movements evoked by stimuli containing two conflicting motion components: a local component designed to excite motion-selective cells with a particular speed tuning and a displacement component designed to excite cells with a sequence of spatial receptive fields. Pursuit eye movements were driven primarily by the local-motion component and were affected to only a small degree by the rate of target displacement across visual space. Extracellular single-unit recordings using the same stimuli revealed that the responses of cells in the middle temporal visual area (MT) depended primarily on the local-motion component but were influenced by the displacement component to the same degree as were pursuit eye movements. We conclude that the initiation of pursuit is consistent with a reconstruction of target speed based on the speed tuning of the active population of MT cells.