McSorley Eugene, Findlay John M
Department of Psychology, Royal Holloway, University of London, Egham, Surrey, UK.
J Vis. 2003 Dec 29;3(11):877-92. doi: 10.1167/3.11.20.
We report four experiments with search displays of Gabor patches. Our aim was to study the accuracy of gaze control in search tasks. In Experiment 1, a target was presented with a single distractor Gabor of a different spatial frequency on the same axis. Subjects could locate the target with the first saccade if the distractor was more distant, but when the distractor was between the fixation point and the target, the first saccade landed much closer to the distractor. In Experiment 2, the number of display items was increased to 16 in a double ring configuration. With this configuration, first saccades were accurately directed to the target, even when there was an intervening distractor in exactly the same configuration as in Experiment 1. Experiment 3 suggested that the improvement in accuracy was not due to distractor homogeneity but rather may be attributable to the increased first saccade latency with the ring configuration. In the final experiment, latency was shown to covary with saccade accuracy. The results are related to a general framework whereby the presence of distractors operates to hold fixation for a longer period of time, thus allowing a greater period of visual processing and more accurate eye movements.
我们报告了四项关于Gabor斑块搜索显示的实验。我们的目的是研究搜索任务中注视控制的准确性。在实验1中，在同一轴上呈现一个目标和一个具有不同空间频率的单一干扰项Gabor。如果干扰项距离更远，受试者可以通过第一次扫视找到目标，但当干扰项位于注视点和目标之间时，第一次扫视落点更靠近干扰项。在实验2中，显示项目的数量增加到16个，呈双环配置。采用这种配置，即使存在与实验1中完全相同配置的中间干扰项，第一次扫视也能准确地指向目标。实验3表明，准确性的提高不是由于干扰项的同质性，而是可能归因于环配置下第一次扫视潜伏期的增加。在最后一项实验中，潜伏期与扫视准确性相关。这些结果与一个通用框架相关，即干扰项的存在会使注视保持更长时间，从而允许更长时间的视觉处理和更准确的眼球运动。
