Lukavský Jiří
Institute of Psychology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
J Vis. 2013 Jun 13;13(7):9. doi: 10.1167/13.7.9.
Contrary to other tasks (free viewing, recognition, visual search), participants often fail to recognize repetition of trials in multiple object tracking (MOT). This study examines the intra- and interindividual variability of eye movements in repeated MOT trials along with the adherence of eye movements to the previously described strategies. I collected eye movement data from 20 subjects during 64 MOT trials at slow speed (5°/s). Half of the trials were repeated four times, and the remaining trials were unique. I measured the variability of eye-movement patterns during repeated trials using normalized scanpath saliency extended to the temporal domain. People tended to make similar eye movements during repeated presentations (with no or vague feeling of repetition) and the interindividual similarity remained at the same level over time. Several strategies (centroid strategy and its variants) were compared with data and they accounted for 48.8% to 54.3% of eye-movement variability, which was less then variability explained by other peoples' eye movements (68.6%). The results show that the observed intra- and interindividual similarity of eye movements is only partly explained by the current models.
与其他任务（自由观看、识别、视觉搜索）不同，参与者在多目标跟踪（MOT）中常常无法识别试验的重复。本研究考察了重复MOT试验中眼动的个体内和个体间变异性，以及眼动对先前描述策略的遵循情况。我在64次低速（5°/秒）的MOT试验中收集了20名受试者的眼动数据。其中一半试验重复进行了四次，其余试验为单次试验。我使用扩展到时间域的归一化扫描路径显著性来测量重复试验期间眼动模式的变异性。在重复呈现过程中（没有重复感或重复感模糊），人们倾向于做出相似的眼动，并且个体间的相似性随时间保持在同一水平。将几种策略（质心策略及其变体）与数据进行了比较，它们解释了48.8%至54.3%的眼动变异性，这低于其他人眼动所解释的变异性（68.6%）。结果表明，观察到的眼动个体内和个体间相似性仅部分由当前模型解释。
