Lighting-from-above prior in biological motion perception

The visual system is able to recognize body motion from impoverished stimuli. This requires combining stimulus information with visual priors. We present a new visual illusion showing that one of these priors is the assumption that bodies are typically illuminated from above. A change of illuminatio...

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Published in:Scientific reports 2018-01, Vol.8 (1), p.1507-10, Article 1507
Main Authors: Fedorov, Leonid A., Dijkstra, Tjeerd M. H., Giese, Martin A.
Format: Article
Language:English
Subjects:
631/378/116/1925
631/378/2613/1483
631/378/2649/1723
Accuracy
Experiments
Humanities and Social Sciences
Humans
Illumination
Illusions
Light
Lighting
Lighting - methods
Locomotion
Models, Neurological
Motion detection
Motion Perception
multidisciplinary
Perceptions
Science
Science (multidisciplinary)
Shading
Visual Pathways - physiology
Visual perception
Visual stimuli
Visual system
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Giese, Martin A.
description The visual system is able to recognize body motion from impoverished stimuli. This requires combining stimulus information with visual priors. We present a new visual illusion showing that one of these priors is the assumption that bodies are typically illuminated from above. A change of illumination direction from above to below flips the perceived locomotion direction of a biological motion stimulus. Control experiments show that the underlying mechanism is different from shape-from-shading and directly combines information about body motion with a lighting-from-above prior. We further show that the illusion is critically dependent on the intrinsic luminance gradients of the most mobile parts of the moving body. We present a neural model with physiologically plausible mechanisms that accounts for the illusion and shows how the illumination prior might be encoded within the visual pathway. Our experiments demonstrate, for the first time, a direct influence of illumination priors in high-level motion vision.
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subjects 631/378/116/1925
631/378/2613/1483
631/378/2649/1723
Accuracy
Experiments
Humanities and Social Sciences
Humans
Illumination
Illusions
Light
Lighting
Lighting - methods
Locomotion
Models, Neurological
Motion detection
Motion Perception
multidisciplinary
Perceptions
Science
Science (multidisciplinary)
Shading
Visual Pathways - physiology
Visual perception
Visual stimuli
Visual system
title Lighting-from-above prior in biological motion perception
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