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Relation matters: relative depth order is stored in working memory for depth.
Jiehui Qian1, Zhuolun Li2, Ke Zhang2
1Department of Psychology, Sun Yat-Sen University, Guangzhou, 510006, China. qianjh3@mail.sysu.edu.cn.
Psychonomic Bulletin & Review
|January 18, 2020
Summary
Working memory for depth relies on relative depth order, not absolute depth. Memory performance is better when depth order changes, indicating a relational representation of visual depth information.
Area of Science:
- Cognitive psychology
- Neuroscience
- Visual perception
Background:
- Working memory (WM) extensively studied for verbal and visual data.
- Limited research on depth information storage in WM.
- Understanding WM for 3D spatial information is crucial.
Purpose of the Study:
- Investigate how depth information is stored in working memory.
- Determine the role of relative depth order versus absolute depth.
- Explore the impact of change magnitude on depth memory.
Main Methods:
- Participants detected changes in stereoscopic depth.
- Manipulated relative depth order (constant vs. changed).
- Varied the magnitude of depth change.
Main Results:
- Memory performance was low for constant relative depth order.
- Performance improved significantly when relative depth order changed.
- Increased change magnitude enhanced performance only when depth order was constant.
- Performance remained high with changed depth order, irrespective of magnitude.
Conclusions:
- Relative depth order is a superior cue for working memory performance compared to absolute metric depth.
- Depth information in WM is represented relationally, not as independent units.
- This relational principle is fundamental to visual system's organization of depth.
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