Bimanual Grasping Adheres to Weber's Law

Weber's law states that our ability to detect changes in stimulus attributes decreases linearly with their magnitude. This principle holds true for many attributes across sensory modalities but appears to be violated in grasping. One explanation for the failure to observe Weber's law in gr...

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Autores principales:	Constanze Hesse, Róisín Elaine Harrison, Martin Giesel, Thomas Schenk
Formato:	article
Lenguaje:	EN
Publicado:	SAGE Publishing 2021
Materias:	Psychology BF1-990
Acceso en línea:	https://doaj.org/article/398f07e810c84e26b91042a646c60843
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id	oai:doaj.org-article:398f07e810c84e26b91042a646c60843
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spelling	oai:doaj.org-article:398f07e810c84e26b91042a646c608432021-12-01T23:33:22ZBimanual Grasping Adheres to Weber's Law2041-669510.1177/20416695211054534https://doaj.org/article/398f07e810c84e26b91042a646c608432021-11-01T00:00:00Zhttps://doi.org/10.1177/20416695211054534https://doaj.org/toc/2041-6695Weber's law states that our ability to detect changes in stimulus attributes decreases linearly with their magnitude. This principle holds true for many attributes across sensory modalities but appears to be violated in grasping. One explanation for the failure to observe Weber's law in grasping is that its effect is masked by biomechanical constraints of the hand. We tested this hypothesis using a bimanual task that eliminates biomechanical constraints. Participants either grasped differently sized boxes that were comfortably within their arm span (action task) or estimated their width (perceptual task). Within each task, there were two conditions: One where the hands’ start positions remained fixed for all object sizes (meaning the distance between the initial and final hand-positions varied with object size), and one in which the hands’ start positions adapted with object size (such that the distance between the initial and final hand-position remained constant). We observed adherence to Weber's law in bimanual estimation and grasping across both conditions. Our results conflict with a previous study that reported the absence of Weber's law in bimanual grasping. We discuss potential explanations for these divergent findings and encourage further research on whether Weber's law persists when biomechanical constraints are reduced.Constanze HesseRóisín Elaine HarrisonMartin GieselThomas SchenkSAGE PublishingarticlePsychologyBF1-990ENi-Perception, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Psychology BF1-990
spellingShingle	Psychology BF1-990 Constanze Hesse Róisín Elaine Harrison Martin Giesel Thomas Schenk Bimanual Grasping Adheres to Weber's Law
description	Weber's law states that our ability to detect changes in stimulus attributes decreases linearly with their magnitude. This principle holds true for many attributes across sensory modalities but appears to be violated in grasping. One explanation for the failure to observe Weber's law in grasping is that its effect is masked by biomechanical constraints of the hand. We tested this hypothesis using a bimanual task that eliminates biomechanical constraints. Participants either grasped differently sized boxes that were comfortably within their arm span (action task) or estimated their width (perceptual task). Within each task, there were two conditions: One where the hands’ start positions remained fixed for all object sizes (meaning the distance between the initial and final hand-positions varied with object size), and one in which the hands’ start positions adapted with object size (such that the distance between the initial and final hand-position remained constant). We observed adherence to Weber's law in bimanual estimation and grasping across both conditions. Our results conflict with a previous study that reported the absence of Weber's law in bimanual grasping. We discuss potential explanations for these divergent findings and encourage further research on whether Weber's law persists when biomechanical constraints are reduced.
format	article
author	Constanze Hesse Róisín Elaine Harrison Martin Giesel Thomas Schenk
author_facet	Constanze Hesse Róisín Elaine Harrison Martin Giesel Thomas Schenk
author_sort	Constanze Hesse
title	Bimanual Grasping Adheres to Weber's Law
title_short	Bimanual Grasping Adheres to Weber's Law
title_full	Bimanual Grasping Adheres to Weber's Law
title_fullStr	Bimanual Grasping Adheres to Weber's Law
title_full_unstemmed	Bimanual Grasping Adheres to Weber's Law
title_sort	bimanual grasping adheres to weber's law
publisher	SAGE Publishing
publishDate	2021
url	https://doaj.org/article/398f07e810c84e26b91042a646c60843
work_keys_str_mv	AT constanzehesse bimanualgraspingadherestoweberslaw AT roisinelaineharrison bimanualgraspingadherestoweberslaw AT martingiesel bimanualgraspingadherestoweberslaw AT thomasschenk bimanualgraspingadherestoweberslaw
_version_	1718403977919332352

Bimanual Grasping Adheres to Weber's Law

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