Transfer and generalization of learned manipulation between unimanual and bimanual tasks

Abstract Successful object manipulation, such as preventing object roll, relies on the modulation of forces and centers of pressure (point of application of digits on each grasp surface) prior to lift onset to generate a compensatory torque. Whether or not generalization of learned manipulation can...

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Autores principales:	Trevor Lee-Miller, Marco Santello, Andrew M. Gordon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6079636c3aa443b8ac4223958df747c5
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spelling	oai:doaj.org-article:6079636c3aa443b8ac4223958df747c52021-12-02T18:27:48ZTransfer and generalization of learned manipulation between unimanual and bimanual tasks10.1038/s41598-021-87988-02045-2322https://doaj.org/article/6079636c3aa443b8ac4223958df747c52021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87988-0https://doaj.org/toc/2045-2322Abstract Successful object manipulation, such as preventing object roll, relies on the modulation of forces and centers of pressure (point of application of digits on each grasp surface) prior to lift onset to generate a compensatory torque. Whether or not generalization of learned manipulation can occur after adding or removing effectors is not known. We examined this by recruiting participants to perform lifts in unimanual and bimanual grasps and analyzed results before and after transfer. Our results show partial generalization of learned manipulation occurred when switching from a (1) unimanual to bimanual grasp regardless of object center of mass, and (2) bimanual to unimanual grasp when the center of mass was on the thumb side. Partial generalization was driven by the modulation of effectors’ center of pressure, in the appropriate direction but of insufficient magnitude, while load forces did not contribute to torque generation after transfer. In addition, we show that the combination of effector forces and centers of pressure in the generation of compensatory torque differ between unimanual and bimanual grasping. These findings highlight that (1) high-level representations of learned manipulation enable only partial learning transfer when adding or removing effectors, and (2) such partial generalization is mainly driven by modulation of effectors’ center of pressure.Trevor Lee-MillerMarco SantelloAndrew M. GordonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Trevor Lee-Miller Marco Santello Andrew M. Gordon Transfer and generalization of learned manipulation between unimanual and bimanual tasks
description	Abstract Successful object manipulation, such as preventing object roll, relies on the modulation of forces and centers of pressure (point of application of digits on each grasp surface) prior to lift onset to generate a compensatory torque. Whether or not generalization of learned manipulation can occur after adding or removing effectors is not known. We examined this by recruiting participants to perform lifts in unimanual and bimanual grasps and analyzed results before and after transfer. Our results show partial generalization of learned manipulation occurred when switching from a (1) unimanual to bimanual grasp regardless of object center of mass, and (2) bimanual to unimanual grasp when the center of mass was on the thumb side. Partial generalization was driven by the modulation of effectors’ center of pressure, in the appropriate direction but of insufficient magnitude, while load forces did not contribute to torque generation after transfer. In addition, we show that the combination of effector forces and centers of pressure in the generation of compensatory torque differ between unimanual and bimanual grasping. These findings highlight that (1) high-level representations of learned manipulation enable only partial learning transfer when adding or removing effectors, and (2) such partial generalization is mainly driven by modulation of effectors’ center of pressure.
format	article
author	Trevor Lee-Miller Marco Santello Andrew M. Gordon
author_facet	Trevor Lee-Miller Marco Santello Andrew M. Gordon
author_sort	Trevor Lee-Miller
title	Transfer and generalization of learned manipulation between unimanual and bimanual tasks
title_short	Transfer and generalization of learned manipulation between unimanual and bimanual tasks
title_full	Transfer and generalization of learned manipulation between unimanual and bimanual tasks
title_fullStr	Transfer and generalization of learned manipulation between unimanual and bimanual tasks
title_full_unstemmed	Transfer and generalization of learned manipulation between unimanual and bimanual tasks
title_sort	transfer and generalization of learned manipulation between unimanual and bimanual tasks
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6079636c3aa443b8ac4223958df747c5
work_keys_str_mv	AT trevorleemiller transferandgeneralizationoflearnedmanipulationbetweenunimanualandbimanualtasks AT marcosantello transferandgeneralizationoflearnedmanipulationbetweenunimanualandbimanualtasks AT andrewmgordon transferandgeneralizationoflearnedmanipulationbetweenunimanualandbimanualtasks
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Transfer and generalization of learned manipulation between unimanual and bimanual tasks

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