Wu Esther X W, Gilani Syed Omer, van Boxtel Jeroen J A, Amihai Ido, Chua Fook Kee, Yen Shih-Cheng
Department of Electrical and Computer Engineering, National University of Singapore, Singapore.
J Vis. 2013 Oct 24;13(12):17. doi: 10.1167/13.12.17.
Previous studies have shown that saccade plans during natural scene viewing can be programmed in parallel. This evidence comes mainly from temporal indicators, i.e., fixation durations and latencies. In the current study, we asked whether eye movement positions recorded during scene viewing also reflect parallel programming of saccades. As participants viewed scenes in preparation for a memory task, their inspection of the scene was suddenly disrupted by a transition to another scene. We examined whether saccades after the transition were invariably directed immediately toward the center or were contingent on saccade onset times relative to the transition. The results, which showed a dissociation in eye movement behavior between two groups of saccades after the scene transition, supported the parallel programming account. Saccades with relatively long onset times (>100 ms) after the transition were directed immediately toward the center of the scene, probably to restart scene exploration. Saccades with short onset times (<100 ms) moved to the center only one saccade later. Our data on eye movement positions provide novel evidence of parallel programming of saccades during scene viewing. Additionally, results from the analyses of intersaccadic intervals were also consistent with the parallel programming hypothesis.
先前的研究表明，在自然场景观看过程中的扫视计划可以并行编程。这一证据主要来自时间指标，即注视持续时间和潜伏期。在当前的研究中，我们探讨了在场景观看过程中记录的眼动位置是否也反映了扫视的并行编程。当参与者观看场景以准备记忆任务时，他们对场景的检查突然被切换到另一个场景所打断。我们研究了切换后的扫视是否总是立即指向中心，或者是否取决于相对于切换的扫视起始时间。结果表明，在场景切换后两组扫视的眼动行为出现了分离，这支持了并行编程的观点。切换后起始时间相对较长（>100毫秒）的扫视会立即指向场景中心，可能是为了重新开始场景探索。起始时间较短（<100毫秒）的扫视只会在一次扫视后移向中心。我们关于眼动位置的数据为场景观看过程中扫视的并行编程提供了新的证据。此外，扫视间隔分析的结果也与并行编程假设一致。
