Ahissar Ehud, Arieli Amos, Fried Moshe, Bonneh Yoram
Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.
Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.
Vision Res. 2016 Jan;118:25-30. doi: 10.1016/j.visres.2014.12.004. Epub 2014 Dec 19.
During natural viewing large saccades shift the visual gaze from one target to another every few hundreds of milliseconds. The role of microsaccades (MSs), small saccades that show up during long fixations, is still debated. A major debate is whether MSs are used to redirect the visual gaze to a new location or to encode visual information through their movement. We argue that these two functions cannot be optimized simultaneously and present several pieces of evidence suggesting that MSs redirect the visual gaze and that the visual details are sampled and encoded by ocular drifts. We show that drift movements are indeed suitable for visual encoding. Yet, it is not clear to what extent drift movements are controlled by the visual system, and to what extent they interact with saccadic movements. We analyze several possible control schemes for saccadic and drift movements and propose experiments that can discriminate between them. We present the results of preliminary analyses of existing data as a sanity check to the testability of our predictions.
在自然视觉过程中，大的眼跳运动每隔几百毫秒就会将视觉注视从一个目标转移到另一个目标。微眼跳（MSs），即在长时间注视期间出现的小眼跳，其作用仍存在争议。一个主要的争议是微眼跳是用于将视觉注视重新定向到新位置，还是通过其运动对视觉信息进行编码。我们认为这两种功能无法同时得到优化，并提供了几条证据表明微眼跳会重新定向视觉注视，而视觉细节是通过眼球漂移进行采样和编码的。我们表明漂移运动确实适合视觉编码。然而，目前尚不清楚漂移运动在多大程度上受视觉系统控制，以及它们与眼跳运动在多大程度上相互作用。我们分析了眼跳和漂移运动的几种可能控制方案，并提出了能够区分它们的实验。我们展示了对现有数据的初步分析结果，作为对我们预测可测试性的合理性检查。
