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Acta Psychologica Sinica    2018, Vol. 50 Issue (11) : 1235-1248     DOI: 10.3724/SP.J.1041.2018.01235
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The grouping effect of common fate in multiple object tracking
Luming HU1,Jing SU1,Liuqing WEI1,Xuemin ZHANG1,2()
1 Beijing Key Laboratory of Applied Experimental Psychology; National Demonstration Center for Experimental Psychology Education (Beijing Normal University); Faculty of Psychology, Beijing Normal University
2 State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China
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Abstract  

The automatic grouping effect is the finding that inter-target grouping improves performance, while target-distractor grouping impairs performance during multiple object tracking (MOT). Many features can induce the automatic grouping effect, such as color, shape, interpolation, and symmetry. However, none of these features are spatial-temporal. Motion information is the principal spatial-temporal feature, and it plays an important role in multiple object tracking (MOT). Using motion information stored in visual spatial working memory (VSWM), people can not only keep track of multiple moving targets among identical distractors, but also periodically extrapolate the motion trajectory of targets. We investigated whether or not participants can use motion information as the basis of the automatic grouping effect just as they can with other feature (e.g. color, shape) during attention tracking.

To test this question, we used classic random motion as the baseline and added two new types of chasing motion in MOT tasks. One chasing motion condition was target-chase-target; the other chasing motion condition was distractor-chase-target. Given that surface features can influence the grouping effect based on motion information, we next tested the motion-based grouping effect in a condition where targets and distractors are assigned different color combinations (Experiment 2) and different shape combinations (Experiment 3). The different color combinations included identical color between targets and distractors, distinct colors between targets and distractors, and mixed colors between targets and distractors. The shape combinations were analogous to the color combinations.

Results of Experiment 1 showed that, compared to the random motion condition, tracking performance was better when targets chased targets and worse when distractors chased targets. In other words, motion information can be used as an automatic grouping cue. Results of Experiment 2 indicated that the tracking performance in the target-chase-target condition was always better than the distractor-chase-target condition when colors were identical, distinct, or mixed. However, compared with the identical color condition, the difference between chasing conditions (target-chase-target condition minus distractor-chase-target condition) was smaller in both the distinct color condition and the mixed color condition. When Experiment 3 varied the surface feature from color to shape, the results were the same as Experiment 2. The surface feature (i.e., color and shape) did not eliminate the motion-based grouping effect, but it did reduce the difference between the target-chase-target condition and distractor-chase-target condition.

From these results, we can conclude that motion information can be used in multiple object tracking and may be an automatic grouping feature. This suggests that spatial-temporal features can also induce automatic grouping, regardless of the effect of surface feature in MOT tasks. It may also imply that, although motion information is encoded automatically and in parallel during tracking, it may share visual spatial working memory resources with surface feature. Finally, motion-based grouping effect in MOT showed that the gestalt law was embodied in attentive tracking.

Keywords multiple object tracking      common fate      motion information      grouping effect     
ZTFLH:  B842  
Corresponding Authors: Xuemin ZHANG     E-mail: xmzhang@bnu.edu.cn
Issue Date: 25 September 2018
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Luming HU
Jing SU
Liuqing WEI
Xuemin ZHANG
Cite this article:   
Luming HU,Jing SU,Liuqing WEI, et al. The grouping effect of common fate in multiple object tracking[J]. Acta Psychologica Sinica, 2018, 50(11): 1235-1248.
URL:  
http://journal.psych.ac.cn/xlxb/EN/10.3724/SP.J.1041.2018.01235     OR     http://journal.psych.ac.cn/xlxb/EN/Y2018/V50/I11/1235
  
  
  
  
条件命名 运动分组 颜色分组 组合条件解释
组合1 目标与目标配对 颜色相同 目标与目标配对追赶运动, 且目标和非目标为同一颜色
组合2 目标与目标配对 颜色不同 目标与目标配对追赶运动, 且目标为一种颜色, 非目标为另一种颜色
组合3 目标与目标配对 颜色混合 目标与目标配对追赶运动, 且一半目标和一半非目标为同一种颜色, 另一半目标和另一半非目标为另一种颜色
组合4 目标与非目标配对 颜色相同 非目标与目标配对追赶运动, 且目标和非目标为同一颜色
组合5 目标与非目标配对 颜色不同 非目标与目标配对追赶运动, 且目标为一种颜色, 非目标为另一种颜色
组合6 目标与非目标配对 颜色混合 非目标与目标配对追赶运动, 且一半目标和一半非目标为同一种颜色, 另一半目标和另一半非目标为另一种颜色
  
  
  
  
  
  
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