McSorley Eugene, McCloy Rachel, Lyne Clare
Department of Psychology, University of Reading, Berkshire RG6 6AL, UK.
Vision Res. 2012 May 1;60:61-72. doi: 10.1016/j.visres.2012.03.007. Epub 2012 Mar 24.
Remote transient changes in the environment, such as the onset of visual distractors, impact on the execution of target directed saccadic eye movements. Studies that have examined the latency of the saccade response have shown conflicting results. When there was an element of target selection, saccade latency increased as the distance between distractor and target increased. In contrast, when target selection is minimized by restricting the target to appear on one axis position, latency has been found to be slowest when the distractor is shown at fixation and reduces as it moves away from this position, rather than from the target. Here we report four experiments examining saccade latency as target and distractor positions are varied. We find support for both a dependence of saccade latency on distractor distance from target and from fixation: saccade latency was longer when distractor is shown close to fixation and even longer still when shown in an opposite location (180°) to the target. We suggest that this is due to inhibitory interactions between the distractor, fixation and the target interfering with fixation disengagement and target selection.
环境中的远程瞬态变化，如视觉干扰物的出现，会影响目标导向的扫视眼动的执行。研究扫视反应潜伏期的研究结果相互矛盾。当存在目标选择因素时，随着干扰物与目标之间距离的增加，扫视潜伏期会延长。相比之下，当通过将目标限制在一个轴位置出现来最小化目标选择时，已发现当干扰物出现在注视点时潜伏期最慢，并且随着它远离该位置（而不是远离目标）潜伏期会缩短。在此，我们报告了四项实验，研究随着目标和干扰物位置的变化扫视潜伏期的情况。我们发现扫视潜伏期既依赖于干扰物与目标之间的距离，也依赖于干扰物与注视点之间的距离：当干扰物靠近注视点显示时，扫视潜伏期更长，当在与目标相反的位置（180°）显示时，扫视潜伏期甚至更长。我们认为这是由于干扰物、注视点和目标之间的抑制性相互作用干扰了注视脱离和目标选择。
