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| Research article summary (published 14 Apr 2002): |
Visuospatial updating of reaching targets in near and far space.
Full Abstract
The brain constructs multiple representations of near and far space but it is unclear which spatial mechanism guides reaching across eye movements in near space. Retinocentric reaching representations are known to exist in parietal cortex, but must be updated during eye movements, in order to remain accurate. In contrast, non-retinal (e.g. muscle-centered) reaching plans in motor cortex do not require updating, and so may provide a more stable encoding mechanism. To test between these, we employed a behavioral test. Subjects briefly foveated a target (located at various depths in near and far space) looked peripherally, then reached toward its remembered location. Surprisingly, subjects did not use the stable non-retinal reaching plan (compared to controls without eye movements). Instead, the intervening eye movements induced a systematic pattern of reaching errors for targets at all depths consistent with updating in a retinal frame. We conclude that a common eye-centered updating mechanism prevails in programming arm movements in both near and far space.
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Author information
Author/s: Medendorp, W Pieter (WP); Crawford, J Douglas (JD);
Affiliation: Canadian Institutes of Health Research Group for Action and Perception, Centre for Vision Research, York University, 4700 Keele Street, Toronto, Ont. M3J 1P3, Canada.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Neuroreport (Neuroreport), published in England. (Language: eng)
Reference: 2002-Apr; vol 13 (issue 5) : pp 633-6
Dates: Created 2002/04/25; Completed 2002/06/24; Revised 2006/11/15;
PMID: 11973460, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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