Abstract
Psychophysical studies of reaching movements suggest that hand kinematics
are learned from errors in extent and direction in an extrinsic coordinate
system, whereas dynamics are learned from proprioceptive errors in
an intrinsic coordinate system. We examined consolidation and interference
to determine if these two forms of learning were independent. Learning
and consolidation of two novel transformations, a rotated spatial
reference frame and altered intersegmental dynamics, did not interfere
with each other and consolidated in parallel. Thus separate kinematic
and dynamic models were constructed simultaneously based on errors
computed in different coordinate frames, and possibly, in different
sensory modalities, using separate working-memory systems. These
results suggest that computational approaches to motor learning should
include two separate performance errors rather than one.
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