Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.

In the size-weight illusion (SWI), a small object feels heavier than an equally-weighted larger object. It is thought that this illusion is a consequence of the way that we internally represent objects' properties--lifters expect one object to outweigh the other, and the subsequent illusion ref...

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Autores principales:	Gavin Buckingham, Melvyn A Goodale
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/60811ad04e9c40c68915bea3beda83c3
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spelling	oai:doaj.org-article:60811ad04e9c40c68915bea3beda83c32021-11-18T08:00:26ZSize matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.1932-620310.1371/journal.pone.0054709https://doaj.org/article/60811ad04e9c40c68915bea3beda83c32013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23372759/?tool=EBIhttps://doaj.org/toc/1932-6203In the size-weight illusion (SWI), a small object feels heavier than an equally-weighted larger object. It is thought that this illusion is a consequence of the way that we internally represent objects' properties--lifters expect one object to outweigh the other, and the subsequent illusion reflects a contrast with their expectations. Similar internal representations are also thought to guide the application of fingertip forces when we grip and lift objects. To determine the nature of the representations underpinning how we lift objects and perceive their weights, we examined weight judgments in addition to the dynamics and magnitudes of the fingertip forces when individuals lifted small and large exemplars of metal and polystyrene cubes, all of which had been adjusted to have exactly the same mass. Prior to starting the experiment, subjects expected the density of the metal cubes to be higher than that of the polystyrene cubes. Their illusions, however, did not reflect their conscious expectations of heaviness; instead subjects experienced a SWI of the same magnitude regardless of the cubes' material. Nevertheless, they did report that the polystyrene cubes felt heavier than the metal ones (i.e. they experienced a material-weight illusion). Subjects persisted in lifting the large metal cube with more force than the small metal cube, but lifted the large polystyrene cube with roughly the same amount of force that they used to lift the small polystyrene cube. These findings suggest that our perceptual and sensorimotor representations are not only functionally independent from one another, but that the perceptual system represents a more single, simple size-weight relationship which appears to drive the SWI itself.Gavin BuckinghamMelvyn A GoodalePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 1, p e54709 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gavin Buckingham Melvyn A Goodale Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
description	In the size-weight illusion (SWI), a small object feels heavier than an equally-weighted larger object. It is thought that this illusion is a consequence of the way that we internally represent objects' properties--lifters expect one object to outweigh the other, and the subsequent illusion reflects a contrast with their expectations. Similar internal representations are also thought to guide the application of fingertip forces when we grip and lift objects. To determine the nature of the representations underpinning how we lift objects and perceive their weights, we examined weight judgments in addition to the dynamics and magnitudes of the fingertip forces when individuals lifted small and large exemplars of metal and polystyrene cubes, all of which had been adjusted to have exactly the same mass. Prior to starting the experiment, subjects expected the density of the metal cubes to be higher than that of the polystyrene cubes. Their illusions, however, did not reflect their conscious expectations of heaviness; instead subjects experienced a SWI of the same magnitude regardless of the cubes' material. Nevertheless, they did report that the polystyrene cubes felt heavier than the metal ones (i.e. they experienced a material-weight illusion). Subjects persisted in lifting the large metal cube with more force than the small metal cube, but lifted the large polystyrene cube with roughly the same amount of force that they used to lift the small polystyrene cube. These findings suggest that our perceptual and sensorimotor representations are not only functionally independent from one another, but that the perceptual system represents a more single, simple size-weight relationship which appears to drive the SWI itself.
format	article
author	Gavin Buckingham Melvyn A Goodale
author_facet	Gavin Buckingham Melvyn A Goodale
author_sort	Gavin Buckingham
title	Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
title_short	Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
title_full	Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
title_fullStr	Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
title_full_unstemmed	Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
title_sort	size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/60811ad04e9c40c68915bea3beda83c3
work_keys_str_mv	AT gavinbuckingham sizemattersasinglerepresentationunderliesourperceptionsofheavinessinthesizeweightillusion AT melvynagoodale sizemattersasinglerepresentationunderliesourperceptionsofheavinessinthesizeweightillusion
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Size matters: a single representation underlies our perceptions of heaviness in the size-weight illusion.

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