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Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli

Judging the speed of objects moving in three dimensions is important in our everyday lives because we interact with objects in a three-dimensional world. However, speed perception has been seldom studied for motion in depth, particularly when using monocular cues such as looming. Here, we compared s...

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Autores principales: Lee, Abigail R. I., Ales, Justin M., Harris, Julie M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7557783/
https://www.ncbi.nlm.nih.gov/pubmed/32640601
http://dx.doi.org/10.3390/vision4030033
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author Lee, Abigail R. I.
Ales, Justin M.
Harris, Julie M.
author_facet Lee, Abigail R. I.
Ales, Justin M.
Harris, Julie M.
author_sort Lee, Abigail R. I.
collection PubMed
description Judging the speed of objects moving in three dimensions is important in our everyday lives because we interact with objects in a three-dimensional world. However, speed perception has been seldom studied for motion in depth, particularly when using monocular cues such as looming. Here, we compared speed discrimination, and speed change discrimination, for looming stimuli, in order to better understand what visual information is used for these tasks. For the speed discrimination task, we manipulated the distance and duration information available, in order to investigate if participants were specifically using speed information. For speed change discrimination, total distance and duration were held constant; hence, they could not be used to successfully perform that task. For the speed change discrimination task, our data were consistent with observers not responding specifically to speed changes within an interval. Instead, they may have used alternative, arguably less optimal, strategies to complete the task. Evidence suggested that participants used a variety of cues to complete the speed discrimination task, not always solely relying on speed. Further, our data suggested that participants may have switched between cues on a trial to trial basis. We conclude that speed changes in looming stimuli were not used in a speed change discrimination task, and that naïve participants may not always exclusively use speed for speed discrimination.
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spelling pubmed-75577832020-10-20 Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli Lee, Abigail R. I. Ales, Justin M. Harris, Julie M. Vision (Basel) Article Judging the speed of objects moving in three dimensions is important in our everyday lives because we interact with objects in a three-dimensional world. However, speed perception has been seldom studied for motion in depth, particularly when using monocular cues such as looming. Here, we compared speed discrimination, and speed change discrimination, for looming stimuli, in order to better understand what visual information is used for these tasks. For the speed discrimination task, we manipulated the distance and duration information available, in order to investigate if participants were specifically using speed information. For speed change discrimination, total distance and duration were held constant; hence, they could not be used to successfully perform that task. For the speed change discrimination task, our data were consistent with observers not responding specifically to speed changes within an interval. Instead, they may have used alternative, arguably less optimal, strategies to complete the task. Evidence suggested that participants used a variety of cues to complete the speed discrimination task, not always solely relying on speed. Further, our data suggested that participants may have switched between cues on a trial to trial basis. We conclude that speed changes in looming stimuli were not used in a speed change discrimination task, and that naïve participants may not always exclusively use speed for speed discrimination. MDPI 2020-07-06 /pmc/articles/PMC7557783/ /pubmed/32640601 http://dx.doi.org/10.3390/vision4030033 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lee, Abigail R. I.
Ales, Justin M.
Harris, Julie M.
Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli
title Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli
title_full Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli
title_fullStr Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli
title_full_unstemmed Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli
title_short Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli
title_sort three-dimensional motion perception: comparing speed and speed change discrimination for looming stimuli
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7557783/
https://www.ncbi.nlm.nih.gov/pubmed/32640601
http://dx.doi.org/10.3390/vision4030033
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