| Perception of object motion in three-dimensional space induced by cast shadows. | |
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MedLine Citation:
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PMID: 20692350 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Cast shadows can be salient depth cues in three-dimensional (3D) vision. Using a motion illusion in which a ball is perceived to roll in depth on the bottom or to flow in the front plane depending on the slope of the trajectory of its cast shadow, we investigated cortical mechanisms underlying 3D vision based on cast shadows using fMRI techniques. When modified versions of the original illusion, in which the slope of the shadow trajectory (shadow slope) was changed in 5 steps from the same one as the ball trajectory to the horizontal, were presented to participants, their perceived ball trajectory shifted gradually from rolling on the bottom to floating in the front plane as the change of the shadow slope. This observation suggests that the perception of the ball trajectory in this illusion is strongly affected by the motion of the cast shadow. In the fMRI study, cortical activity during observation of the movies of the illusion was investigated. We found that the bilateral posterior-occipital sulcus (POS) and right ventral precuneus showed activation related to the perception of the ball trajectory induced by the cast shadows in the illusion. Of these areas, it was suggested that the right POS may be involved in the inferring of the ball trajectory by the given spatial relation between the ball and the shadow. Our present results suggest that the posterior portion of the medial parietal cortex may be involved in 3D vision by cast shadows. |
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Authors:
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Narumi Katsuyama; Nobuo Usui; Izuru Nose; Masato Taira |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-06 |
Journal Detail:
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Title: NeuroImage Volume: 54 ISSN: 1095-9572 ISO Abbreviation: Neuroimage Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-10-22 Completed Date: 2011-01-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9215515 Medline TA: Neuroimage Country: United States |
Other Details:
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Languages: eng Pagination: 485-94 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Division of Applied System Neuroscience, Nihon University School of Medicine, Itabashi, Tokyo, Japan. katz.cnb@tmd.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Behavior Brain Mapping / methods Depth Perception / physiology* Female Frontal Lobe / physiology Gyrus Cinguli / physiology Humans Magnetic Resonance Imaging / methods Male Motion Perception / physiology* Motion Pictures as Topic Parietal Lobe / physiology* Size Perception / physiology* Temporal Lobe / physiology Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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