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Context-dependent arm pointing adaptationWe sought to determine the effectiveness of head posture as a contextual cue to facilitate adaptive transitions in manual control during visuomotor distortions. Subjects performed arm pointing movements by drawing on a digitizing tablet, with targets and movement trajectories displayed in real time on a computer monitor. Adaptation was induced by presenting the trajectories in an altered gain format on the monitor. The subjects were shown visual displays of their movements that corresponded to either 0.5 or 1.5 scaling of the movements made. Subjects were assigned to three groups: the head orientation group tilted the head towards the right shoulder when drawing under a 0.5 gain of display and towards the left shoulder when drawing under a 1.5 gain of display; the target orientation group had the home and target positions rotated counterclockwise when drawing under the 0.5 gain and clockwise for the 1.5 gain; the arm posture group changed the elbow angle of the arm they were not drawing with from full flexion to full extension with 0.5 and 1.5 gain display changes. To determine if contextual cues were associated with display alternations, the gain changes were returned to the standard (1.0) display. Aftereffects were assessed to determine the efficacy of the head orientation contextual cue compared to the two control cues. The head orientation cue was effectively associated with the multiple gains. The target orientation cue also demonstrated some effectiveness while the arm posture cue did not. The results demonstrate that contextual cues can be used to switch between multiple adaptive states. These data provide support for the idea that static head orientation information is a crucial component to the arm adaptation process. These data further define the functional linkage between head posture and arm pointing movements.
Document ID
20040112596
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Authors
Seidler, R. D.
(Arizona State University PO Box 870404, Tempe, AZ 85287-0404, United States)
Bloomberg, J. J.
Stelmach, G. E.
Date Acquired
August 21, 2013
Publication Date
March 15, 2001
Publication Information
Publication: Behavioural brain research
Volume: 119
Issue: 2
ISSN: 0166-4328
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Clinical Trial
NASA Discipline Neuroscience
Randomized Controlled Trial
NASA Center JSC

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