Inter-limb generalization of visuomotor adaptation is more automatic when the perturbation is aligned in extrinsic and joint-based coordinates
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1
The University of Queensland, School of Human Movement Studies, Australia
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2
Université Bordeaux Segalen, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, France
Many questions remain regarding how and why new visuomotor maps obtained with one limb can benefit the other. In an isometric aiming context, we recently found strong, immediate transfer of adaptation between limbs for a sagittal plane workspace where the visuomotor distortion had identical effects in eye- and joint-based coordinates bilaterally, but no transfer in a frontal plane workspace where an identical visual distortion had opposite effects for the two limbs in joint-based coordinates. This suggests that mixed transfer results reported previously for reaching tasks in the horizontal plane might be explained by coordinate frame conflicts associated with the mirror symmetry of the limbs. Here we compared cross-limb transfer of adaptation to visuomotor rotation (45 deg) in a planar reaching task (16 targets) when the limb and visual feedback were oriented in the sagittal (n=8) or the horizontal plane (n=8). Each person completed two sessions in counterbalanced order; one to assess transfer from the right arm to the left and another from left to right. There was significant transfer of feedforward performance to the untrained limb in both horizontal and sagittal conditions (angular error at 20% of target distance: Sagittal = 45%, Horizontal = 18%), but transfer of overall reach performance was significantly greater for the Sagittal than Horizontal group (total path length to target: Sagittal = 58%, Horizontal = 30%. Moreover, reaction times were significantly higher during the first trials in the transfer phase for horizontal than sagittal groups (497 ms versus 380 ms), suggesting a greater cognitive component to horizontal plane error reduction. The results contrast markedly with previous data for isometric force aiming and reaching with veridical, virtual reality feedback, which suggests that the location of the visual display relative to the physical workspace critically influences transfer of new visuomotor maps to the opposite limb.
Keywords:
reaching,
motor learning,
visuomotor rotation,
Sensorimotor adaptation,
Hemispheric asymmetries,
Inter-limb Transfer
Conference:
XII International Conference on Cognitive Neuroscience (ICON-XII), Brisbane, Queensland, Australia, 27 Jul - 31 Jul, 2014.
Presentation Type:
Poster
Topic:
Motor Behaviour
Citation:
Carroll
T,
Poh
E,
Duarte Ferreira
T and
De Rugy
A
(2015). Inter-limb generalization of visuomotor adaptation is more automatic when the perturbation is aligned in extrinsic and joint-based coordinates.
Conference Abstract:
XII International Conference on Cognitive Neuroscience (ICON-XII).
doi: 10.3389/conf.fnhum.2015.217.00072
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Received:
19 Feb 2015;
Published Online:
24 Apr 2015.
*
Correspondence:
Prof. Timothy Carroll, The University of Queensland, School of Human Movement Studies, Brisbane, Australia, timothy.carroll@uq.edu.au