Catching what we can't see: manual interception of occluded fly-ball trajectories.

Control of interceptive actions may involve fine interplay between feedback-based and predictive mechanisms. These processes rely heavily on target motion information available when the target is visible. However, short-term visual memory signals as well as implicit knowledge about the environment m...

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Autores principales:	Gianfranco Bosco, Sergio Delle Monache, Francesco Lacquaniti
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/77e20156b2c8441baf1b7dcef9e1ca66
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id	oai:doaj.org-article:77e20156b2c8441baf1b7dcef9e1ca66
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spelling	oai:doaj.org-article:77e20156b2c8441baf1b7dcef9e1ca662021-11-18T08:08:45ZCatching what we can't see: manual interception of occluded fly-ball trajectories.1932-620310.1371/journal.pone.0049381https://doaj.org/article/77e20156b2c8441baf1b7dcef9e1ca662012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23166653/?tool=EBIhttps://doaj.org/toc/1932-6203Control of interceptive actions may involve fine interplay between feedback-based and predictive mechanisms. These processes rely heavily on target motion information available when the target is visible. However, short-term visual memory signals as well as implicit knowledge about the environment may also contribute to elaborate a predictive representation of the target trajectory, especially when visual feedback is partially unavailable because other objects occlude the visual target. To determine how different processes and information sources are integrated in the control of the interceptive action, we manipulated a computer-generated visual environment representing a baseball game. Twenty-four subjects intercepted fly-ball trajectories by moving a mouse cursor and by indicating the interception with a button press. In two separate sessions, fly-ball trajectories were either fully visible or occluded for 750, 1000 or 1250 ms before ball landing. Natural ball motion was perturbed during the descending trajectory with effects of either weightlessness (0 g) or increased gravity (2 g) at times such that, for occluded trajectories, 500 ms of perturbed motion were visible before ball disappearance. To examine the contribution of previous visual experience with the perturbed trajectories to the interception of invisible targets, the order of visible and occluded sessions was permuted among subjects. Under these experimental conditions, we showed that, with fully visible targets, subjects combined servo-control and predictive strategies. Instead, when intercepting occluded targets, subjects relied mostly on predictive mechanisms based, however, on different type of information depending on previous visual experience. In fact, subjects without prior experience of the perturbed trajectories showed interceptive errors consistent with predictive estimates of the ball trajectory based on a-priori knowledge of gravity. Conversely, the interceptive responses of subjects previously exposed to fully visible trajectories were compatible with the fact that implicit knowledge of the perturbed motion was also taken into account for the extrapolation of occluded trajectories.Gianfranco BoscoSergio Delle MonacheFrancesco LacquanitiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 11, p e49381 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gianfranco Bosco Sergio Delle Monache Francesco Lacquaniti Catching what we can't see: manual interception of occluded fly-ball trajectories.
description	Control of interceptive actions may involve fine interplay between feedback-based and predictive mechanisms. These processes rely heavily on target motion information available when the target is visible. However, short-term visual memory signals as well as implicit knowledge about the environment may also contribute to elaborate a predictive representation of the target trajectory, especially when visual feedback is partially unavailable because other objects occlude the visual target. To determine how different processes and information sources are integrated in the control of the interceptive action, we manipulated a computer-generated visual environment representing a baseball game. Twenty-four subjects intercepted fly-ball trajectories by moving a mouse cursor and by indicating the interception with a button press. In two separate sessions, fly-ball trajectories were either fully visible or occluded for 750, 1000 or 1250 ms before ball landing. Natural ball motion was perturbed during the descending trajectory with effects of either weightlessness (0 g) or increased gravity (2 g) at times such that, for occluded trajectories, 500 ms of perturbed motion were visible before ball disappearance. To examine the contribution of previous visual experience with the perturbed trajectories to the interception of invisible targets, the order of visible and occluded sessions was permuted among subjects. Under these experimental conditions, we showed that, with fully visible targets, subjects combined servo-control and predictive strategies. Instead, when intercepting occluded targets, subjects relied mostly on predictive mechanisms based, however, on different type of information depending on previous visual experience. In fact, subjects without prior experience of the perturbed trajectories showed interceptive errors consistent with predictive estimates of the ball trajectory based on a-priori knowledge of gravity. Conversely, the interceptive responses of subjects previously exposed to fully visible trajectories were compatible with the fact that implicit knowledge of the perturbed motion was also taken into account for the extrapolation of occluded trajectories.
format	article
author	Gianfranco Bosco Sergio Delle Monache Francesco Lacquaniti
author_facet	Gianfranco Bosco Sergio Delle Monache Francesco Lacquaniti
author_sort	Gianfranco Bosco
title	Catching what we can't see: manual interception of occluded fly-ball trajectories.
title_short	Catching what we can't see: manual interception of occluded fly-ball trajectories.
title_full	Catching what we can't see: manual interception of occluded fly-ball trajectories.
title_fullStr	Catching what we can't see: manual interception of occluded fly-ball trajectories.
title_full_unstemmed	Catching what we can't see: manual interception of occluded fly-ball trajectories.
title_sort	catching what we can't see: manual interception of occluded fly-ball trajectories.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/77e20156b2c8441baf1b7dcef9e1ca66
work_keys_str_mv	AT gianfrancobosco catchingwhatwecantseemanualinterceptionofoccludedflyballtrajectories AT sergiodellemonache catchingwhatwecantseemanualinterceptionofoccludedflyballtrajectories AT francescolacquaniti catchingwhatwecantseemanualinterceptionofoccludedflyballtrajectories
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Catching what we can't see: manual interception of occluded fly-ball trajectories.

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