Alteration of Visual Perception prior to Microsaccades
Alteration of Visual Perception prior to Microsaccades
复制标题
DOI：
10.1016/j.neuron.2012.12.014
复制
发表时间：
2013-02-20
期刊：
影响因子：
16.2
通讯作者：
Hafed, Ziad M.
中科院分区：
文献类型：
--
作者：
Hafed, Ziad M.
注视是一个主动过程，不断发生微小的眼球运动，包括微眼跳。虽然微跳视的视网膜后果可能由于其微小的尺寸而被认为是最小的，但这些运动的显着感知后果也可能源于与其运动产生的必然结果相关的活跃的视网膜外机制。在这里，我表明，在微眼跳发生之前，空间感知以一种非常特定的方式发生改变：中央凹刺激被错误地感知为更加偏心，而周围刺激则被渲染为更加中央凹。这种感知“空间压缩”的机制与即将到来的眼球运动引起的视觉表征的空间特定增益调制一致，正如假设的更大的眼跳会发生的那样。然后，我证明这种微扫视知觉改变至少具有一个重要的功能后果：它介导视觉表现改变，类似于传统上归因于隐蔽视觉注意的认知过程的改变。
Gaze fixation is an active process, with the incessant occurrence of tiny eye movements, including microsaccades. While the retinal consequences of microsaccades may be presumed minimal because of their minute size, a significant perceptual consequence of these movements can also stem from active extraretinal mechanisms associated with corollaries of their motor generation. Here I show that prior to microsaccade onset, spatial perception is altered in a very specific manner: foveal stimuli are erroneously perceived as more eccentric, whereas peripheral stimuli are rendered more foveal. The mechanism for this perceptual "compression of space" is consistent with a spatially specific gain modulation of visual representations caused by the upcoming eye movements, as is hypothesized to happen for much larger saccades. I then demonstrate that this perimicrosaccadic perceptual alteration has at least one important functional consequence: it mediates visual-performance alterations similar to ones classically attributed to the cognitive process of covert visual attention.