Perceptual judgments of duration of parabolic motions

Abstract In a 2-alternative forced-choice protocol, observers judged the duration of ball motions shown on an immersive virtual-reality display as approaching in the sagittal plane along parabolic trajectories compatible with Earth gravity effects. In different trials, the ball shifted along the par...

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Autores principales:	Björn Jörges, Barbara La Scaleia, Joan López-Moliner, Francesco Lacquaniti, Myrka Zago
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f8601656dcd54d28afdd310282b1a13e
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id	oai:doaj.org-article:f8601656dcd54d28afdd310282b1a13e
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spelling	oai:doaj.org-article:f8601656dcd54d28afdd310282b1a13e2021-12-02T13:26:59ZPerceptual judgments of duration of parabolic motions10.1038/s41598-021-86428-32045-2322https://doaj.org/article/f8601656dcd54d28afdd310282b1a13e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86428-3https://doaj.org/toc/2045-2322Abstract In a 2-alternative forced-choice protocol, observers judged the duration of ball motions shown on an immersive virtual-reality display as approaching in the sagittal plane along parabolic trajectories compatible with Earth gravity effects. In different trials, the ball shifted along the parabolas with one of three different laws of motion: constant tangential velocity, constant vertical velocity, or gravitational acceleration. Only the latter motion was fully consistent with Newton’s laws in the Earth gravitational field, whereas the motions with constant velocity profiles obeyed the spatio-temporal constraint of parabolic paths dictated by gravity but violated the kinematic constraints. We found that the discrimination of duration was accurate and precise for all types of motions, but the discrimination for the trajectories at constant tangential velocity was slightly but significantly more precise than that for the trajectories at gravitational acceleration or constant vertical velocity. The results are compatible with a heuristic internal representation of gravity effects that can be engaged when viewing projectiles shifting along parabolic paths compatible with Earth gravity, irrespective of the specific kinematics. Opportunistic use of a moving frame attached to the target may favour visual tracking of targets with constant tangential velocity, accounting for the slightly superior duration discrimination.Björn JörgesBarbara La ScaleiaJoan López-MolinerFrancesco LacquanitiMyrka ZagoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Björn Jörges Barbara La Scaleia Joan López-Moliner Francesco Lacquaniti Myrka Zago Perceptual judgments of duration of parabolic motions
description	Abstract In a 2-alternative forced-choice protocol, observers judged the duration of ball motions shown on an immersive virtual-reality display as approaching in the sagittal plane along parabolic trajectories compatible with Earth gravity effects. In different trials, the ball shifted along the parabolas with one of three different laws of motion: constant tangential velocity, constant vertical velocity, or gravitational acceleration. Only the latter motion was fully consistent with Newton’s laws in the Earth gravitational field, whereas the motions with constant velocity profiles obeyed the spatio-temporal constraint of parabolic paths dictated by gravity but violated the kinematic constraints. We found that the discrimination of duration was accurate and precise for all types of motions, but the discrimination for the trajectories at constant tangential velocity was slightly but significantly more precise than that for the trajectories at gravitational acceleration or constant vertical velocity. The results are compatible with a heuristic internal representation of gravity effects that can be engaged when viewing projectiles shifting along parabolic paths compatible with Earth gravity, irrespective of the specific kinematics. Opportunistic use of a moving frame attached to the target may favour visual tracking of targets with constant tangential velocity, accounting for the slightly superior duration discrimination.
format	article
author	Björn Jörges Barbara La Scaleia Joan López-Moliner Francesco Lacquaniti Myrka Zago
author_facet	Björn Jörges Barbara La Scaleia Joan López-Moliner Francesco Lacquaniti Myrka Zago
author_sort	Björn Jörges
title	Perceptual judgments of duration of parabolic motions
title_short	Perceptual judgments of duration of parabolic motions
title_full	Perceptual judgments of duration of parabolic motions
title_fullStr	Perceptual judgments of duration of parabolic motions
title_full_unstemmed	Perceptual judgments of duration of parabolic motions
title_sort	perceptual judgments of duration of parabolic motions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f8601656dcd54d28afdd310282b1a13e
work_keys_str_mv	AT bjornjorges perceptualjudgmentsofdurationofparabolicmotions AT barbaralascaleia perceptualjudgmentsofdurationofparabolicmotions AT joanlopezmoliner perceptualjudgmentsofdurationofparabolicmotions AT francescolacquaniti perceptualjudgmentsofdurationofparabolicmotions AT myrkazago perceptualjudgmentsofdurationofparabolicmotions
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Perceptual judgments of duration of parabolic motions

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