Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.

When grasping an object, the opening between the fingertips (grip aperture) scales with the size of the object. If an object changes in size, the grip aperture has to be corrected. In this study, it was investigated whether such corrections would influence the perceived size of objects. The grasping...

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Autor principal:	Vonne van Polanen
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/957e3d1f18f9404897b449ff1e79224a
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spelling	oai:doaj.org-article:957e3d1f18f9404897b449ff1e79224a2021-12-02T20:08:16ZGrasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.1932-620310.1371/journal.pone.0248084https://doaj.org/article/957e3d1f18f9404897b449ff1e79224a2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0248084https://doaj.org/toc/1932-6203When grasping an object, the opening between the fingertips (grip aperture) scales with the size of the object. If an object changes in size, the grip aperture has to be corrected. In this study, it was investigated whether such corrections would influence the perceived size of objects. The grasping plan was manipulated with a preview of the object, after which participants initiated their reaching movement without vision. In a minority of the grasps, the object changed in size after the preview and participants had to adjust their grasping movement. Visual feedback was manipulated in two experiments. In experiment 1, vision was restored during reach and both visual and haptic information was available to correct the grasp and lift the object. In experiment 2, no visual information was provided during the movement and grasps could only be corrected using haptic information. Participants made reach-to-grasp movements towards two objects and compared these in size. Results showed that participants adjusted their grasp to a change in object size from preview to grasped object in both experiments. However, a change in object size did not bias the perception of object size or alter discrimination performance. In experiment 2, a small perceptual bias was found when objects changed from large to small. However, this bias was much smaller than the difference that could be discriminated and could not be considered meaningful. Therefore, it can be concluded that the planning and execution of reach-to-grasp movements do not reliably affect the perception of object size.Vonne van PolanenPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 9, p e0248084 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Vonne van Polanen Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
description	When grasping an object, the opening between the fingertips (grip aperture) scales with the size of the object. If an object changes in size, the grip aperture has to be corrected. In this study, it was investigated whether such corrections would influence the perceived size of objects. The grasping plan was manipulated with a preview of the object, after which participants initiated their reaching movement without vision. In a minority of the grasps, the object changed in size after the preview and participants had to adjust their grasping movement. Visual feedback was manipulated in two experiments. In experiment 1, vision was restored during reach and both visual and haptic information was available to correct the grasp and lift the object. In experiment 2, no visual information was provided during the movement and grasps could only be corrected using haptic information. Participants made reach-to-grasp movements towards two objects and compared these in size. Results showed that participants adjusted their grasp to a change in object size from preview to grasped object in both experiments. However, a change in object size did not bias the perception of object size or alter discrimination performance. In experiment 2, a small perceptual bias was found when objects changed from large to small. However, this bias was much smaller than the difference that could be discriminated and could not be considered meaningful. Therefore, it can be concluded that the planning and execution of reach-to-grasp movements do not reliably affect the perception of object size.
format	article
author	Vonne van Polanen
author_facet	Vonne van Polanen
author_sort	Vonne van Polanen
title	Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
title_short	Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
title_full	Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
title_fullStr	Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
title_full_unstemmed	Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
title_sort	grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/957e3d1f18f9404897b449ff1e79224a
work_keys_str_mv	AT vonnevanpolanen graspaperturecorrectionsinreachtograspmovementsdonotreliablyaltersizeperception
_version_	1718375195917418496

Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception.

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