Melcher David, Morrone M Concetta
Faculty of Psychology, Universitá Vita-salute San Raffaele, Via Olgettina 58, Milan, Italy.
Nat Neurosci. 2003 Aug;6(8):877-81. doi: 10.1038/nn1098.
Saccadic eye movements pose many challenges for stable and continuous vision, such as how information from successive fixations is amalgamated into a single precept. Here we show in humans that motion signals are temporally integrated across separate fixations, but only when the motion stimulus falls either on the same retinal region (retinotopic integration) or on different retinal positions that correspond to the same external spatial coordinates (spatiotopic integration). We used individual motion signals that were below detection threshold, implicating spatiotopic trans-saccadic integration in relatively early stages of visual processing such as the middle temporal area (MT) or V5 of visual cortex. The trans-saccadic buildup of important congruent visual information while irrelevant non-congruent information fades could provide a simple and robust strategy to stabilize perception during eye movements.
扫视眼动给稳定和持续的视觉带来了诸多挑战，比如来自连续注视的信息是如何整合为一个单一感知的。在此我们在人类身上发现，运动信号会在不同的注视之间进行时间整合，但前提是运动刺激落在相同的视网膜区域（视网膜拓扑整合）或者落在对应相同外部空间坐标的不同视网膜位置上（空间拓扑整合）。我们使用了低于检测阈值的个体运动信号，这表明在视觉处理的相对早期阶段，如视觉皮层的中颞区（MT）或V5区，存在空间拓扑跨扫视整合。在不相关的非一致信息消退时，重要的一致视觉信息的跨扫视积累能够提供一种简单而稳健的策略，以在眼动过程中稳定感知。
