| Audiogravic and oculogravic illusions represent a unified spatial remapping. | |
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MedLine Citation:
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PMID: 20062982 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Individuals exposed to both an increase in magnitude and a rotation of the gravitoinerital acceleration vector experience changes in visual and auditory localization and apparent body orientation. These effects are known as the oculogravic, audiogravic and somatogravic illusions, respectively. In our main experiment, we measured the magnitude, direction, and time course of the audiogravic and oculogravic illusions in recumbent subjects (n = 6) exposed to an increase to 2 g and a simultaneous 60 degrees rotation of the gravitoinertial acceleration (GIA) vector in their azimuthal plane (around their z-axis) in the Brandeis slow rotation room. In separate runs, subjects used a pointer to indicate the apparent azimuthal location of auditory and visual targets and of their head midline. Parallel, time linked changes in auditory, visual, and haptic localization of comparable magnitude and direction occurred. Two additional subjects adjusted the onset asynchrony of a pair of pulsing tactors on the forehead until they experienced a fused, midline sensation. A vibrotactile shift occurred during exposure to altered GIA in the same direction as the auditory, visual, and haptic shifts. These parallel multimodal results point to a GIA-induced remapping of a peripersonal spatial referent as underlying the changes in localization of auditory, visual, and somatosensory stimuli. Vestibular, somatosensory, and oculomotor signals could contribute to the proposed shift in the reference system. |
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Authors:
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James R Lackner; Paul DiZio |
Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-01-09 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Exp?rimentation c?r?brale Volume: 202 ISSN: 1432-1106 ISO Abbreviation: Exp Brain Res Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-04-01 Completed Date: 2010-06-30 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: 513-8 Citation Subset: IM |
Affiliation:
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Ashton Graybiel Spatial Orientation Laboratory, MS 033, Brandeis University, Waltham, MA 02454-9110, USA. lackner@brandeis.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Adult Female Humans Illusions* Male Photic Stimulation Physical Stimulation Psychoacoustics Psychophysics Rotation Sound Localization* Space Perception* Supine Position Task Performance and Analysis Time Factors Touch Perception* Vibration Visual Perception* Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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