title: How to break the configuration of moving objects? Geometric invariance in visual working memory.
abstract: Visual working memory is highly sensitive to global configurations in addition to the features of each object. When objects move, their configuration varies correspondingly. In this study, we explored the geometric rules governing the maintenance of a dynamic configuration in visual working memory. Our investigation is guided by Klein's Erlangen program, a hierarchy of geometric stability that includes affine, projective, and topological invariants. In a change-detection task, memory displays were categorized by which geometric invariance was violated by the objects' motions. The results showed that (a) there was no decrement in memory performance until the projective invariance was violated, (b) more dramatic changes (such as a topological change) did not further enlarge the decrement, and (c) objects causing the violation of projective invariance were better encoded into memory. These results collectively demonstrate that projective invariance is the only geometric property determining the maintenance of a dynamic configuration in visual working memory.
authors.affiliation: Department of Psychology and Behavioral Sciences, Zhejiang University.
authors.forename: Zhongqiang
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Department of Psychology and Behavioral Sciences, Zhejiang University.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Psychology and Behavioral Sciences, Zhejiang University.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Yu
authors.affiliation: Department of Psychology and Behavioral Sciences, Zhejiang University.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Psychology and Behavioral Sciences, Zhejiang University.
authors.forename: Rende
authors.initials: R
authors.lastname: Shui
authors.affiliation: Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology.
authors.forename: Tao
authors.initials: T
authors.lastname: Gao
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology*; D009039:Motion Perception / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D055815:Young Adult