Early and Late Modulation of Saccade Deviations by Target Distractor Similarity
Early and Late Modulation of Saccade Deviations by Target Distractor Similarity
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DOI：
10.1152/jn.00068.2009
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发表时间：
2009-09-01
影响因子：
2.5
通讯作者：
Theeuwes, Jan
中科院分区：
文献类型：
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作者：
Mulckhuyse, Manon;Van der Stigchel, Stefan;Theeuwes, Jan
Mulckhuyse M，货车der Stigchel S，Theeuwes J.通过目标干扰物相似性对扫视偏差的早期和晚期调制。神经生理学杂志102：1451 - 1458，2009年。首次发表于2009年6月24日; doi：10.1152/jn.00068.2009。在这项研究中，我们调查了自下而上和自上而下的选择过程中眼跳轨迹偏差作为一个独立的措施之间的竞争的时间过程。我们使用了一个范例，在这个范例中，我们通过在相对于目标起始的不同时间点偏移注视点来操纵扫视潜伏期。在实验一中，观察者扫视一个充满颜色的圆圈，而另一个无关的分心圆。干扰物是相似的（即，相同）或与目标不同。结果表明，短时间眼跳偏离的强度受目标干扰物相似性的影响。为了排除相似干扰物仅仅因为与目标物相同而影响扫视轨迹的可能性，实验2中的干扰物为正方形，其颜色与目标物相似或不相似。结果表明，目标干扰物的相似性对短、长延迟的偏差都有调节作用。当眼跳时间短，我们发现较少的眼跳偏离从一个类似的比从一个不同的干扰。当眼跳潜伏期长，相反的模式被发现：更多的眼跳偏离从一个类似的比从一个不相似的干扰。与以前的研究结果相比，我们的研究表明，任务相关的信息已经可以影响眼控制的早期过程。我们的结论是，眼跳目标之间的竞争受到两个不同的过程与不同的时间进程：一个快速激活过程信号的显着性和任务相关性的位置和一个较慢的抑制过程抑制该位置。
Mulckhuyse M, Van der Stigchel S, Theeuwes J. Early and late modulation of saccade deviations by target distractor similarity. J Neurophysiol 102: 1451-1458, 2009. First published June 24, 2009; doi:10.1152/jn.00068.2009. In this study, we investigated the time course of oculomotor competition between bottom-up and top-down selection processes using saccade trajectory deviations as a dependent measure. We used a paradigm in which we manipulated saccade latency by offsetting the fixation point at different time points relative to target onset. In experiment 1, observers made a saccade to a filled colored circle while another irrelevant distractor circle was presented. The distractor was either similar (i.e., identical) or dissimilar to the target. Results showed that the strength of saccade deviation was modulated by target distractor similarity for short saccade latencies. To rule out the possibility that the similar distractor affected the saccade trajectory merely because it was identical to the target, the distractor in experiment 2 was a square shape of which only the color was similar or dissimilar to the target. The results showed that deviations for both short and long latencies were modulated by target distractor similarity. When saccade latencies were short, we found less saccade deviation away from a similar than from a dissimilar distractor. When saccade latencies were long, the opposite pattern was found: more saccade deviation away from a similar than from a dissimilar distractor. In contrast to previous findings, our study shows that task-relevant information can already influence the early processes of oculomotor control. We conclude that competition between saccadic goals is subject to two different processes with different time courses: one fast activating process signaling the saliency and task relevance of a location and one slower inhibitory process suppressing that location.