Independent working memory resources for egocentric and allocentric spatial information

PLoS Computational Biology
David Aagten-Murphy, Paul M Bays

Abstract

Visuospatial working memory enables us to maintain access to visual information for processing even when a stimulus is no longer present, due to occlusion, our own movements, or transience of the stimulus. Here we show that, when localizing remembered stimuli, the precision of spatial recall does not rely solely on memory for individual stimuli, but additionally depends on the relative distances between stimuli and visual landmarks in the surroundings. Across three separate experiments, we consistently observed a spatially selective improvement in the precision of recall for items located near a persistent landmark. While the results did not require that the landmark be visible throughout the memory delay period, it was essential that it was visible both during encoding and response. We present a simple model that can accurately capture human performance by considering relative (allocentric) spatial information as an independent localization estimate which degrades with distance and is optimally integrated with egocentric spatial information. Critically, allocentric information was encoded without cost to egocentric estimation, demonstrating independent storage of the two sources of information. Finally, when egocentric and all...Continue Reading

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Citations

Oct 18, 2019·Annals of the New York Academy of Sciences·Ying Chen, J Douglas Crawford
May 12, 2020·Cerebral Cortex·Vishal BharmauriaJohn Douglas Crawford
Mar 17, 2021·Attention, Perception & Psychophysics·Vladislava SegenJan M Wiener
Aug 5, 2021·Journal of Vision·Anne-Sophie LaurinAarlenne Zein Khan

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