| Combination of noisy directional visual and proprioceptive information. | |
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MedLine Citation:
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PMID: 19757906 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We present experimental and computational evidence for the estimation of visual and proprioceptive directional information during forward, visually driven arm movements. We presented noisy directional proprioceptive and visual stimuli simultaneously and in isolation midway during a pointing movement. Directional proprioceptive stimuli were created by brief force pulses, which varied in direction and were applied to the fingertip shortly after movement onset. Subjects indicated the perceived direction of the stimulus after each trial. We measured unimodal performance in trials in which we presented only the visual or only the proprioceptive stimulus. When we presented simultaneous but conflicting bimodal information, subjects' perceived direction fell in between the visual and proprioceptive directions. We find that the judged mean orientation matched the MLE predictions but did not show the expected improvement in reliability as compared to unimodal performance. We present an alternative model (probabilistic cue switching, PCS), which is consistent with our data. According to this model, subjects base their bimodal judgments on only one of two directional cues in a given trial, with relative choice probabilities proportional to the average stimulus reliability. These results suggest that subjects based their decision on a probability mixture of both modalities without integrating information across modalities. |
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Authors:
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Sascha Serwe; Knut Drewing; Julia Trommersh??user |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2009-05-28 |
Journal Detail:
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Title: Journal of vision Volume: 9 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2009 |
Date Detail:
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Created Date: 2009-09-17 Completed Date: 2009-12-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: 28.1-14 Citation Subset: IM |
Affiliation:
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Department of Psychology, Justus Liebig University Giessen, Germany. Sascha.Serwe@psychol.uni-giessen.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Female Humans Male Models, Neurological Motion Perception / physiology* Proprioception / physiology* Psychomotor Performance / physiology* Sensory Thresholds Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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