Harrison James J, Freeman Tom C A, Sumner Petroc
School of Psychology, Cardiff University, Cardiff, UK.
School of Psychology, Cardiff University, Cardiff, UK Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, UK.
J Vis. 2015 Jan 26;15(1):15.1.24. doi: 10.1167/15.1.24.
The natural viewing behavior of moving observers ideally requires target-selecting saccades to be coordinated with automatic gaze-stabilizing eye movements such as optokinetic nystagmus. However, it is unknown whether saccade plans can compensate for reflexive movement of the eye during the variable saccade latency period, and it is unclear whether reflexive nystagmus is even accompanied by extraretinal signals carrying the eye movement information that could potentially underpin such compensation. We show that saccades do partially compensate for optokinetic nystagmus that displaces the eye during the saccade latency period. Moreover, this compensation is as good as for displacements due to voluntary smooth pursuit. In other words, the saccade system appears to be as well coordinated with reflexive nystagmus as it is with volitional pursuit, which in turn implies that extraretinal signals accompany nystagmus and are just as informative as those accompanying pursuit.
移动观察者的自然观看行为理想情况下需要目标选择扫视与自动的注视稳定眼动（如视动性眼球震颤）相协调。然而，尚不清楚扫视计划是否能在可变的扫视潜伏期内补偿眼睛的反射性运动，也不清楚反射性眼球震颤是否甚至伴随着携带可能支持这种补偿的眼动信息的视网膜外信号。我们表明，扫视确实能部分补偿在扫视潜伏期使眼睛移位的视动性眼球震颤。此外，这种补偿与因自愿性平稳跟踪导致的移位补偿效果一样好。换句话说，扫视系统似乎与反射性眼球震颤的协调程度与它与自主性跟踪的协调程度一样，这反过来意味着视网膜外信号伴随着眼球震颤，并且与伴随跟踪的信号一样具有信息性。
