| A solution to the online guidance problem for targeted reaches: proportional rate control using relative disparity tau. | |
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MedLine Citation:
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PMID: 20665012 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We provide a solution to a major problem in visually guided reaching. Research has shown that binocular vision plays an important role in the online visual guidance of reaching, but the visual information and strategy used to guide a reach remains unknown. We propose a new theory of visual guidance of reaching including a new information variable, tau(alpha) (relative disparity tau), and a novel control strategy that allows actors to guide their reach trajectories visually by maintaining a constant proportion between tau(alpha) and its rate of change. The dynamical model couples the information to the reaching movement to generate trajectories characteristic of human reaching. We tested the theory in two experiments in which participants reached under conditions of darkness to guide a visible point either on a sliding apparatus or on their finger to a point-light target in depth. Slider apparatus controlled for a simple mapping from visual to proprioceptive space. When reaching with their finger, participants were forced, by perturbation of visual information used for feedforward control, to use online control with only binocular disparity-based information for guidance. Statistical analyses of trajectories strongly supported the theory. Simulations of the model were compared statistically to actual reaching trajectories. The results supported the theory, showing that tau(alpha) provides a source of information for the control of visually guided reaching and that participants use this information in a proportional rate control strategy. |
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Authors:
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Joe Anderson; Geoffrey P Bingham |
Publication Detail:
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Type: Journal Article Date: 2010-07-28 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 205 ISSN: 1432-1106 ISO Abbreviation: Exp Brain Res Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-18 Completed Date: 2010-12-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 291-306 Citation Subset: IM |
Affiliation:
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Psychological and Brain Sciences, Indiana University, Bloomington, IN 47405, USA. joseande@indiana.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Algorithms Arm / innervation, physiology Darkness Data Interpretation, Statistical Distance Perception / physiology Female Fingers / physiology Humans Male Middle Aged Photic Stimulation Proprioception / physiology Psychomotor Performance / physiology* Space Perception / physiology Vision Disparity / physiology Vision, Binocular / physiology Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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