Bimanual grasping does not adhere to Weber’s law

Abstract According to Weber’s law, a fundamental principle of perception, visual resolution decreases in a linear fashion with an increase in object size. Previous studies have shown, however, that unlike for perception, grasping does not adhere to Weber’s law. Yet, this research was limited by the...

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Autores principales:	Tzvi Ganel, Gal Namdar, Avigail Mirsky
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/883849d9c1c54830b0eb7fc0b22fef35
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spelling	oai:doaj.org-article:883849d9c1c54830b0eb7fc0b22fef352021-12-02T16:07:59ZBimanual grasping does not adhere to Weber’s law10.1038/s41598-017-06799-42045-2322https://doaj.org/article/883849d9c1c54830b0eb7fc0b22fef352017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06799-4https://doaj.org/toc/2045-2322Abstract According to Weber’s law, a fundamental principle of perception, visual resolution decreases in a linear fashion with an increase in object size. Previous studies have shown, however, that unlike for perception, grasping does not adhere to Weber’s law. Yet, this research was limited by the fact that perception and grasping were examined for a restricted range of stimulus sizes bounded by the maximum fingers span. The purpose of the current study was to test the generality of the dissociation between perception and action across a different type of visuomotor task, that of bimanual grasping. Bimanual grasping also allows to effectively measure visual resolution during perception and action across a wide range of stimulus sizes compared to unimanual grasps. Participants grasped or estimated the sizes of large objects using both their hands. The results showed that bimanual grasps violated Weber’s law throughout the entire movement trajectory. In contrast, Just Noticeable Differences (JNDs) for perceptual estimations of the objects increased linearly with size, in agreement with Weber’s law. The findings suggest that visuomotor control, across different types of actions and for a large range of size, is based on absolute rather than on relative representation of object size.Tzvi GanelGal NamdarAvigail MirskyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tzvi Ganel Gal Namdar Avigail Mirsky Bimanual grasping does not adhere to Weber’s law
description	Abstract According to Weber’s law, a fundamental principle of perception, visual resolution decreases in a linear fashion with an increase in object size. Previous studies have shown, however, that unlike for perception, grasping does not adhere to Weber’s law. Yet, this research was limited by the fact that perception and grasping were examined for a restricted range of stimulus sizes bounded by the maximum fingers span. The purpose of the current study was to test the generality of the dissociation between perception and action across a different type of visuomotor task, that of bimanual grasping. Bimanual grasping also allows to effectively measure visual resolution during perception and action across a wide range of stimulus sizes compared to unimanual grasps. Participants grasped or estimated the sizes of large objects using both their hands. The results showed that bimanual grasps violated Weber’s law throughout the entire movement trajectory. In contrast, Just Noticeable Differences (JNDs) for perceptual estimations of the objects increased linearly with size, in agreement with Weber’s law. The findings suggest that visuomotor control, across different types of actions and for a large range of size, is based on absolute rather than on relative representation of object size.
format	article
author	Tzvi Ganel Gal Namdar Avigail Mirsky
author_facet	Tzvi Ganel Gal Namdar Avigail Mirsky
author_sort	Tzvi Ganel
title	Bimanual grasping does not adhere to Weber’s law
title_short	Bimanual grasping does not adhere to Weber’s law
title_full	Bimanual grasping does not adhere to Weber’s law
title_fullStr	Bimanual grasping does not adhere to Weber’s law
title_full_unstemmed	Bimanual grasping does not adhere to Weber’s law
title_sort	bimanual grasping does not adhere to weber’s law
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/883849d9c1c54830b0eb7fc0b22fef35
work_keys_str_mv	AT tzviganel bimanualgraspingdoesnotadheretoweberslaw AT galnamdar bimanualgraspingdoesnotadheretoweberslaw AT avigailmirsky bimanualgraspingdoesnotadheretoweberslaw
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Bimanual grasping does not adhere to Weber’s law

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