Motion along the mental number line reveals shared representations for numerosity and space

ELife
Caspar M SchwiedrzikLucia Melloni

Abstract

Perception of number and space are tightly intertwined. It has been proposed that this is due to 'cortical recycling', where numerosity processing takes over circuits originally processing space. Do such 'recycled' circuits retain their original functionality? Here, we investigate interactions between numerosity and motion direction, two functions that both localize to parietal cortex. We describe a new phenomenon in which visual motion direction adapts nonsymbolic numerosity perception, giving rise to a repulsive aftereffect: motion to the left adapts small numbers, leading to overestimation of numerosity, while motion to the right adapts large numbers, resulting in underestimation. The reference frame of this effect is spatiotopic. Together with the tuning properties of the effect this suggests that motion direction-numerosity cross-adaptation may occur in a homolog of area LIP. 'Cortical recycling' thus expands but does not obliterate the functions originally performed by the recycled circuit, allowing for shared computations across domains.

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Citations

Apr 27, 2016·Psychonomic Bulletin & Review·Lawrence W Barsalou
Aug 10, 2016·ELife·Giovanni AnobileDavid Charles Burr
Oct 19, 2017·Journal of Cognitive Neuroscience·Frank J KanayetJames L McClelland
May 5, 2018·Scientific Reports·Michele FornaciaiRoberto Arrighi
May 13, 2018·The European Journal of Neuroscience·Alice Mado ProverbioFrancesco De Benedetto
Jan 24, 2020·Frontiers in Psychology·Maria Grazia Di BonoKonstantinos Priftis
Feb 2, 2021·Frontiers in Human Neuroscience·Anuj Shukla, Raju S Bapi
Mar 25, 2021·The Quarterly Journal of Experimental Psychology : QJEP·Lauren S AuletStella F Lourenco
May 28, 2021·Scientific Reports·Anuj Shukla, Raju S Bapi
Jul 31, 2021·Frontiers in Psychology·Maciej HamanMichał Gołȩbiowski

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Software Mentioned

SPSS
Palamedes Toolbox
Matlab
Figshare
ARTool

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