Errors in visuospatial working memory across space and time

Abstract Visuospatial working memory (VSWM) involves cortical regions along the dorsal visual pathway, which are topographically organized with respect to the visual space. However, it remains unclear how such functional organization may constrain VSWM behavior across space and time. Here, we system...

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Autores principales:	Linjing Jiang, Hoi-Chung Leung
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f306cd3b3a6e4181a5b4958c67cc9ad9
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spelling	oai:doaj.org-article:f306cd3b3a6e4181a5b4958c67cc9ad92021-12-02T15:33:01ZErrors in visuospatial working memory across space and time10.1038/s41598-021-93858-62045-2322https://doaj.org/article/f306cd3b3a6e4181a5b4958c67cc9ad92021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93858-6https://doaj.org/toc/2045-2322Abstract Visuospatial working memory (VSWM) involves cortical regions along the dorsal visual pathway, which are topographically organized with respect to the visual space. However, it remains unclear how such functional organization may constrain VSWM behavior across space and time. Here, we systematically mapped VSWM performance across the 2-dimensional (2D) space in various retention intervals in human subjects using the memory-guided and visually guided saccade tasks in two experiments. Relative to visually guided saccades, memory-guided saccades showed significant increases in unsystematic errors, or response variability, with increasing target eccentricity (3°–13° of visual angle). Unsystematic errors also increased with increasing delay (1.5–3 s, Experiment 1; 0.5–5 s, Experiment 2), while there was little or no interaction between delay and eccentricity. Continuous bump attractor modeling suggested neurophysiological and functional organization factors in the increasing unsystematic errors in VSWM across space and time. These findings indicate that: (1) VSWM representation may be limited by the functional topology of the visual pathway for the 2D space; (2) Unsystematic errors may reflect accumulated noise from memory maintenance while systematic errors may originate from non-mnemonic processes such as noisy sensorimotor transformation; (3) There may be independent mechanisms supporting the spatial and temporal processing of VSWM.Linjing JiangHoi-Chung LeungNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Linjing Jiang Hoi-Chung Leung Errors in visuospatial working memory across space and time
description	Abstract Visuospatial working memory (VSWM) involves cortical regions along the dorsal visual pathway, which are topographically organized with respect to the visual space. However, it remains unclear how such functional organization may constrain VSWM behavior across space and time. Here, we systematically mapped VSWM performance across the 2-dimensional (2D) space in various retention intervals in human subjects using the memory-guided and visually guided saccade tasks in two experiments. Relative to visually guided saccades, memory-guided saccades showed significant increases in unsystematic errors, or response variability, with increasing target eccentricity (3°–13° of visual angle). Unsystematic errors also increased with increasing delay (1.5–3 s, Experiment 1; 0.5–5 s, Experiment 2), while there was little or no interaction between delay and eccentricity. Continuous bump attractor modeling suggested neurophysiological and functional organization factors in the increasing unsystematic errors in VSWM across space and time. These findings indicate that: (1) VSWM representation may be limited by the functional topology of the visual pathway for the 2D space; (2) Unsystematic errors may reflect accumulated noise from memory maintenance while systematic errors may originate from non-mnemonic processes such as noisy sensorimotor transformation; (3) There may be independent mechanisms supporting the spatial and temporal processing of VSWM.
format	article
author	Linjing Jiang Hoi-Chung Leung
author_facet	Linjing Jiang Hoi-Chung Leung
author_sort	Linjing Jiang
title	Errors in visuospatial working memory across space and time
title_short	Errors in visuospatial working memory across space and time
title_full	Errors in visuospatial working memory across space and time
title_fullStr	Errors in visuospatial working memory across space and time
title_full_unstemmed	Errors in visuospatial working memory across space and time
title_sort	errors in visuospatial working memory across space and time
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f306cd3b3a6e4181a5b4958c67cc9ad9
work_keys_str_mv	AT linjingjiang errorsinvisuospatialworkingmemoryacrossspaceandtime AT hoichungleung errorsinvisuospatialworkingmemoryacrossspaceandtime
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Errors in visuospatial working memory across space and time

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