Improved visual sensitivity during smooth pursuit eye movements
Improved visual sensitivity during smooth pursuit eye movements
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DOI：
10.1038/nn.2194
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发表时间：
2008-10-01
影响因子：
25
通讯作者：
Gegenfurtner, Karl R.
中科院分区：
文献类型：
--
作者：
Schuetz, Alexander C.;Braun, Doris I.;Gegenfurtner, Karl R.
当我们观察周围的世界时，我们的眼睛会不停地转动。这将感兴趣的物体带到中央凹并保持在那里，但是当眼睛移动时，视觉灵敏度会下降。在这里，我们表明人类对某些视觉刺激的敏感性在平滑的眼球运动中得到了改善。在追逐过程中，对短暂闪现的彩色刺激的检测阈值比注视过程低16%。同样，高空间频率的亮度定义刺激的检测阈值被降低。这些发现表明，追求引起的敏感性增加可能有其神经元起源的视网膜-丘脑系统的细胞。这意味着视觉系统不仅使用反馈连接来改善对所关注的位置和对象的处理，而且整个处理子系统可以得到提升。在追踪过程中，细小细胞系统的促进可以减少静止物体的运动模糊，增加对被跟踪物体速度变化的敏感性。
When we view the world around us, we constantly move our eyes. This brings objects of interest into the fovea and keeps them there, but visual sensitivity has been shown to deteriorate while the eyes are moving. Here we show that human sensitivity for some visual stimuli is improved during smooth pursuit eye movements. Detection thresholds for briefly flashed, colored stimuli were 16% lower during pursuit than during fixation. Similarly, detection thresholds for luminance-defined stimuli of high spatial frequency were lowered. These findings suggest that the pursuit-induced sensitivity increase may have its neuronal origin in the parvocellular retino-thalamic system. This implies that the visual system not only uses feedback connections to improve processing for locations and objects being attended to, but that a whole processing subsystem can be boosted. During pursuit, facilitation of the parvocellular system may reduce motion blur for stationary objects and increase sensitivity to speed changes of the tracked object.