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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/34957

Title
Proprioceptive movement illusions due to prolonged stimulation: reversals and aftereffects
Author/Creator
Seizova-Cajic, Tatjana;  Smith, Janette L.;  Taylor, Janet L.;  Gandevia, Simon C.
Description
Background. Adaptation to constant stimulation has often been used to investigate the mechanisms of perceptual coding, but the adaptive processes within the proprioceptive channels that encode body movement have not been well described. We investigated them using vibration as a stimulus because vibration of muscle tendons results in a powerful illusion of movement. Methodology/Principal Findings. We applied sustained 90 Hz vibratory stimulation to biceps brachii, an elbow flexor and induced the expected illusion of elbow extension (in 12 participants). There was clear evidence of adaptation to the movement signal both during the 6-min long vibration and on its cessation. During vibration, the strong initial illusion of extension waxed and waned, with diminishing duration of periods of illusory movement and occasional reversals in the direction of the illusion. After vibration there was an aftereffect in which the stationary elbow seemed to move into flexion. Muscle activity shows no consistent relationship with the variations in perceived movement. Conclusion. We interpret the observed effects as adaptive changes in the central mechanisms that code movement in direction-selective opponent channels.
Relation
PLoS ONE Vol. 2, Issue 10
Publisher Link
http://dx.doi.org/10.1371/journal.pone.0001037
Date
2007
Publisher
Public Library of Science
Keyword(s)
constant stimulation;  proprioceptive channels;  illusory movement
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/34957
Identifier
ISSN:1932-6203
Language
eng
Reviewed
Reviewed
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"PLoS ONE"
 
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