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

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 betwe...

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Detalles Bibliográficos
Autores principales: Schwiedrzik, Caspar M, Bernstein, Benjamin, Melloni, Lucia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: eLife Sciences Publications, Ltd 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4764558/
https://www.ncbi.nlm.nih.gov/pubmed/26771249
http://dx.doi.org/10.7554/eLife.10806
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author Schwiedrzik, Caspar M
Bernstein, Benjamin
Melloni, Lucia
author_facet Schwiedrzik, Caspar M
Bernstein, Benjamin
Melloni, Lucia
author_sort Schwiedrzik, Caspar M
collection PubMed
description 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. DOI: http://dx.doi.org/10.7554/eLife.10806.001
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spelling pubmed-47645582016-02-25 Motion along the mental number line reveals shared representations for numerosity and space Schwiedrzik, Caspar M Bernstein, Benjamin Melloni, Lucia eLife Neuroscience 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. DOI: http://dx.doi.org/10.7554/eLife.10806.001 eLife Sciences Publications, Ltd 2016-01-15 /pmc/articles/PMC4764558/ /pubmed/26771249 http://dx.doi.org/10.7554/eLife.10806 Text en © 2016, Schwiedrzik et al http://creativecommons.org/licenses/by/4.0/ This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Neuroscience
Schwiedrzik, Caspar M
Bernstein, Benjamin
Melloni, Lucia
Motion along the mental number line reveals shared representations for numerosity and space
title Motion along the mental number line reveals shared representations for numerosity and space
title_full Motion along the mental number line reveals shared representations for numerosity and space
title_fullStr Motion along the mental number line reveals shared representations for numerosity and space
title_full_unstemmed Motion along the mental number line reveals shared representations for numerosity and space
title_short Motion along the mental number line reveals shared representations for numerosity and space
title_sort motion along the mental number line reveals shared representations for numerosity and space
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4764558/
https://www.ncbi.nlm.nih.gov/pubmed/26771249
http://dx.doi.org/10.7554/eLife.10806
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