Hafed Ziad M, Krauzlis Richard J
Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.
Nat Neurosci. 2006 Nov;9(11):1449-57. doi: 10.1038/nn1782. Epub 2006 Oct 8.
Eye movements markedly change the pattern of retinal stimulation. To maintain stable vision, the brain possesses a variety of mechanisms that compensate for the retinal consequences of eye movements. However, eye movements may also be important for resolving the ambiguities often posed by visual inputs, because motor commands contain additional spatial information that is necessarily absent from retinal signals. To test this possibility, we used a perceptually ambiguous stimulus composed of four line segments, consistent with a shape whose vertices were occluded. In a passive condition, subjects fixated a spot while the shape translated along a certain trajectory. In several active conditions, the spot, occluder and shape translated such that when subjects tracked the spot, they experienced the same retinal stimulus as during fixation. We found that eye movements significantly promoted perceptual coherence compared to fixation. These results indicate that eye movement information constrains the perceptual interpretation of visual inputs.
眼球运动显著改变视网膜刺激模式。为了维持稳定的视觉，大脑拥有多种机制来补偿眼球运动对视网膜造成的影响。然而，眼球运动对于解决视觉输入常常带来的模糊性可能也很重要，因为运动指令包含视网膜信号中必然不存在的额外空间信息。为了验证这种可能性，我们使用了一种由四条线段组成的感知模糊刺激，它与一个顶点被遮挡的形状相符。在被动条件下，受试者注视一个点，同时形状沿着特定轨迹平移。在几种主动条件下，点、遮挡物和形状一起平移，这样当受试者追踪点时，他们所经历的视网膜刺激与注视时相同。我们发现，与注视相比，眼球运动显著促进了感知连贯性。这些结果表明，眼球运动信息会限制对视觉输入的感知解读。
