Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.

<h4>Background</h4>Our expectations of an object's heaviness not only drive our fingertip forces, but also our perception of heaviness. This effect is highlighted by the classic size-weight illusion (SWI), where different-sized objects of identical mass feel different weights. Here,...

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Autores principales:	Gavin Buckingham, Melvyn A Goodale
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/14bd669c7f6b4c968c0b22aad8da8b93
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spelling	oai:doaj.org-article:14bd669c7f6b4c968c0b22aad8da8b932021-11-25T06:25:27ZLifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.1932-620310.1371/journal.pone.0009709https://doaj.org/article/14bd669c7f6b4c968c0b22aad8da8b932010-03-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20300575/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Our expectations of an object's heaviness not only drive our fingertip forces, but also our perception of heaviness. This effect is highlighted by the classic size-weight illusion (SWI), where different-sized objects of identical mass feel different weights. Here, we examined whether these expectations are sufficient to induce the SWI in a single wooden cube when lifted without visual feedback, by varying the size of the object seen prior to the lift.<h4>Methodology/principal findings</h4>Participants, who believed that they were lifting the same object that they had just seen, reported that the weight of the single, standard-sized cube that they lifted on every trial varied as a function of the size of object they had just seen. Seeing the small object before the lift made the cube feel heavier than it did after seeing the large object. These expectations also affected the fingertip forces that were used to lift the object when vision was not permitted. The expectation-driven errors made in early trials were not corrected with repeated lifting, and participants failed to adapt their grip and load forces from the expected weight to the object's actual mass in the same way that they could when lifting with vision.<h4>Conclusions/significance</h4>Vision appears to be crucial for the detection, and subsequent correction, of the ostensibly non-visual grip and load force errors that are a common feature of this type of object interaction. Expectations of heaviness are not only powerful enough to alter the perception of a single object's weight, but also continually drive the forces we use to lift the object when vision is unavailable.Gavin BuckinghamMelvyn A GoodalePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 3, p e9709 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gavin Buckingham Melvyn A Goodale Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
description	<h4>Background</h4>Our expectations of an object's heaviness not only drive our fingertip forces, but also our perception of heaviness. This effect is highlighted by the classic size-weight illusion (SWI), where different-sized objects of identical mass feel different weights. Here, we examined whether these expectations are sufficient to induce the SWI in a single wooden cube when lifted without visual feedback, by varying the size of the object seen prior to the lift.<h4>Methodology/principal findings</h4>Participants, who believed that they were lifting the same object that they had just seen, reported that the weight of the single, standard-sized cube that they lifted on every trial varied as a function of the size of object they had just seen. Seeing the small object before the lift made the cube feel heavier than it did after seeing the large object. These expectations also affected the fingertip forces that were used to lift the object when vision was not permitted. The expectation-driven errors made in early trials were not corrected with repeated lifting, and participants failed to adapt their grip and load forces from the expected weight to the object's actual mass in the same way that they could when lifting with vision.<h4>Conclusions/significance</h4>Vision appears to be crucial for the detection, and subsequent correction, of the ostensibly non-visual grip and load force errors that are a common feature of this type of object interaction. Expectations of heaviness are not only powerful enough to alter the perception of a single object's weight, but also continually drive the forces we use to lift the object when vision is unavailable.
format	article
author	Gavin Buckingham Melvyn A Goodale
author_facet	Gavin Buckingham Melvyn A Goodale
author_sort	Gavin Buckingham
title	Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
title_short	Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
title_full	Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
title_fullStr	Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
title_full_unstemmed	Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
title_sort	lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/14bd669c7f6b4c968c0b22aad8da8b93
work_keys_str_mv	AT gavinbuckingham liftingwithoutseeingtheroleofvisioninperceivingandactinguponthesizeweightillusion AT melvynagoodale liftingwithoutseeingtheroleofvisioninperceivingandactinguponthesizeweightillusion
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Lifting without seeing: the role of vision in perceiving and acting upon the size weight illusion.

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