Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation

Abstract Competition between simultaneously presented visual stimuli lengthens reaction time and reduces both the BOLD response and neural firing. In contrast, conditions of sequential presentation have been assumed to be free from competition. Here we manipulated the spatial proximity of stimuli (N...

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Autores principales:	Jumana Ahmad, Garrett Swan, Howard Bowman, Brad Wyble, Anna C. Nobre, Kimron L. Shapiro, Fiona McNab
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cd38faca51e0483fa876e7678e994784
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spelling	oai:doaj.org-article:cd38faca51e0483fa876e7678e9947842021-12-02T16:08:00ZCompetitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation10.1038/s41598-017-05011-x2045-2322https://doaj.org/article/cd38faca51e0483fa876e7678e9947842017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05011-xhttps://doaj.org/toc/2045-2322Abstract Competition between simultaneously presented visual stimuli lengthens reaction time and reduces both the BOLD response and neural firing. In contrast, conditions of sequential presentation have been assumed to be free from competition. Here we manipulated the spatial proximity of stimuli (Near versus Far conditions) to examine the effects of simultaneous and sequential competition on different measures of working memory (WM) for colour. With simultaneous presentation, the measure of WM precision was significantly lower for Near items, and participants reported the colour of the wrong item more often. These effects were preserved when the second stimulus immediately followed the first, disappeared when they were separated by 500 ms, and were partly recovered (evident for our measure of mis-binding but not WM precision) when the task was altered to encourage participants to maintain the sequentially presented items together in WM. Our results show, for the first time, that competition affects the measure of WM precision, and challenge the assumption that sequential presentation removes competition.Jumana AhmadGarrett SwanHoward BowmanBrad WybleAnna C. NobreKimron L. ShapiroFiona McNabNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-16 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jumana Ahmad Garrett Swan Howard Bowman Brad Wyble Anna C. Nobre Kimron L. Shapiro Fiona McNab Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
description	Abstract Competition between simultaneously presented visual stimuli lengthens reaction time and reduces both the BOLD response and neural firing. In contrast, conditions of sequential presentation have been assumed to be free from competition. Here we manipulated the spatial proximity of stimuli (Near versus Far conditions) to examine the effects of simultaneous and sequential competition on different measures of working memory (WM) for colour. With simultaneous presentation, the measure of WM precision was significantly lower for Near items, and participants reported the colour of the wrong item more often. These effects were preserved when the second stimulus immediately followed the first, disappeared when they were separated by 500 ms, and were partly recovered (evident for our measure of mis-binding but not WM precision) when the task was altered to encourage participants to maintain the sequentially presented items together in WM. Our results show, for the first time, that competition affects the measure of WM precision, and challenge the assumption that sequential presentation removes competition.
format	article
author	Jumana Ahmad Garrett Swan Howard Bowman Brad Wyble Anna C. Nobre Kimron L. Shapiro Fiona McNab
author_facet	Jumana Ahmad Garrett Swan Howard Bowman Brad Wyble Anna C. Nobre Kimron L. Shapiro Fiona McNab
author_sort	Jumana Ahmad
title	Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
title_short	Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
title_full	Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
title_fullStr	Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
title_full_unstemmed	Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
title_sort	competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/cd38faca51e0483fa876e7678e994784
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Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation

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