Visual adaptation alters the apparent speed of real-world actions

Abstract The apparent physical speed of an object in the field of view remains constant despite variations in retinal velocity due to viewing conditions (velocity constancy). For example, people and cars appear to move across the field of view at the same objective speed regardless of distance. In t...

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Autores principales:	George Mather, Rebecca J. Sharman, Todd Parsons
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1e97b92932d34c5a8e11c9b67a2dffb7
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spelling	oai:doaj.org-article:1e97b92932d34c5a8e11c9b67a2dffb72021-12-02T15:05:31ZVisual adaptation alters the apparent speed of real-world actions10.1038/s41598-017-06841-52045-2322https://doaj.org/article/1e97b92932d34c5a8e11c9b67a2dffb72017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06841-5https://doaj.org/toc/2045-2322Abstract The apparent physical speed of an object in the field of view remains constant despite variations in retinal velocity due to viewing conditions (velocity constancy). For example, people and cars appear to move across the field of view at the same objective speed regardless of distance. In this study a series of experiments investigated the visual processes underpinning judgements of objective speed using an adaptation paradigm and video recordings of natural human locomotion. Viewing a video played in slow-motion for 30 seconds caused participants to perceive subsequently viewed clips played at standard speed as too fast, so playback had to be slowed down in order for it to appear natural; conversely after viewing fast-forward videos for 30 seconds, playback had to be speeded up in order to appear natural. The perceived speed of locomotion shifted towards the speed depicted in the adapting video (‘re-normalisation’). Results were qualitatively different from those obtained in previously reported studies of retinal velocity adaptation. Adapting videos that were scrambled to remove recognizable human figures or coherent motion caused significant, though smaller shifts in apparent locomotion speed, indicating that both low-level and high-level visual properties of the adapting stimulus contributed to the changes in apparent speed.George MatherRebecca J. SharmanTodd ParsonsNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q George Mather Rebecca J. Sharman Todd Parsons Visual adaptation alters the apparent speed of real-world actions
description	Abstract The apparent physical speed of an object in the field of view remains constant despite variations in retinal velocity due to viewing conditions (velocity constancy). For example, people and cars appear to move across the field of view at the same objective speed regardless of distance. In this study a series of experiments investigated the visual processes underpinning judgements of objective speed using an adaptation paradigm and video recordings of natural human locomotion. Viewing a video played in slow-motion for 30 seconds caused participants to perceive subsequently viewed clips played at standard speed as too fast, so playback had to be slowed down in order for it to appear natural; conversely after viewing fast-forward videos for 30 seconds, playback had to be speeded up in order to appear natural. The perceived speed of locomotion shifted towards the speed depicted in the adapting video (‘re-normalisation’). Results were qualitatively different from those obtained in previously reported studies of retinal velocity adaptation. Adapting videos that were scrambled to remove recognizable human figures or coherent motion caused significant, though smaller shifts in apparent locomotion speed, indicating that both low-level and high-level visual properties of the adapting stimulus contributed to the changes in apparent speed.
format	article
author	George Mather Rebecca J. Sharman Todd Parsons
author_facet	George Mather Rebecca J. Sharman Todd Parsons
author_sort	George Mather
title	Visual adaptation alters the apparent speed of real-world actions
title_short	Visual adaptation alters the apparent speed of real-world actions
title_full	Visual adaptation alters the apparent speed of real-world actions
title_fullStr	Visual adaptation alters the apparent speed of real-world actions
title_full_unstemmed	Visual adaptation alters the apparent speed of real-world actions
title_sort	visual adaptation alters the apparent speed of real-world actions
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1e97b92932d34c5a8e11c9b67a2dffb7
work_keys_str_mv	AT georgemather visualadaptationalterstheapparentspeedofrealworldactions AT rebeccajsharman visualadaptationalterstheapparentspeedofrealworldactions AT toddparsons visualadaptationalterstheapparentspeedofrealworldactions
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Visual adaptation alters the apparent speed of real-world actions

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