Tam W J, Ono H
York University, Ontario, Canada.
Percept Psychophys. 1994 Sep;56(3):251-60. doi: 10.3758/bf03209759.
We examined eye-movement latencies to a target that appeared during visual fixation of stationary stimulus, a moving stimulus, or an extrafoveal stimulus. The stimulus at fixation was turned off either before target onset (gap condition) or after target onset (overlap condition). Consistent with previous research, saccadic latencies were shorter in gap conditions than they were in overlap conditions (the gap effect). In Experiment 1, a gap effect was observed for vergence eye movements. In Experiment 2, a gap effect was observed for saccades directed at a target that appeared during visual pursuit of a moving stimulus. In Experiment 3, a gap effect was observed for saccades directed at a target that appeared during extrafoveal fixation. The present results extend reports of the gap effect for saccadic shifts during visual fixation to (a) vergence shifts during visual fixation, (b) saccadic shifts during smooth visual pursuit, and (c) saccadic shifts during extrafoveal fixation. The present findings are discussed with respect to the incompatible goals of fixation-locking and fixation-shifting oculomotor responses.
我们研究了在固定刺激、移动刺激或中央凹外刺激的视觉注视过程中出现目标时的眼动潜伏期。注视点处的刺激在目标出现之前（间隙条件）或之后（重叠条件）关闭。与先前的研究一致，间隙条件下的扫视潜伏期比重叠条件下的短（间隙效应）。在实验1中，观察到了辐辏眼动的间隙效应。在实验2中，观察到了在对移动刺激进行视觉追踪时出现目标的扫视的间隙效应。在实验3中，观察到了在中央凹外注视时出现目标的扫视的间隙效应。目前的结果将视觉注视期间扫视转移的间隙效应的报告扩展到了：（a）视觉注视期间的辐辏转移；（b）平稳视觉追踪期间的扫视转移；（c）中央凹外注视期间的扫视转移。本文就注视锁定和注视转移眼动反应的不相容目标对目前的研究结果进行了讨论。
