TY - JOUR
T1 - Characteristics of implicit sensorimotor adaptation revealed by task-irrelevant clamped feedback
AU - Ryan Morehead, J.
AU - Taylor, Jordan A.
AU - Parvin, Darius E.
AU - Ivry, Richard B.
N1 - Funding Information:
We would like to thank Elizabeth Marrone, Dashel Thompson, Shabnam Bonyadi, and Giana Cirolia for their tireless assistance in keeping J. R. M. organized and helping collect experimental data. This work was supported by NIH grants NS092079 and NS074917 to R. B. I. and NS084948 to J. A. T. J. R. M., J. A. T., and R. B. I. designed all experiments. J. R. M. and D. E. P. directed collection of experimental data. J. R. M. analyzed data. J. R. M., J. A. T., D. E. P., and R. B. I. interpreted the results. J. R. M., J. A. T., and R. B. I. wrote the manuscript.
Publisher Copyright:
© 2017 Massachusetts Institute of Technology.
PY - 2017/6/1
Y1 - 2017/6/1
N2 - Sensorimotor adaptation occurs when there is a discrepancy between the expected and actual sensory consequences of a movement. This learning can be precisely measured, but its source has been hard to pin down because standard adaptation tasks introduce two potential learning signals: task performance errors and sensory prediction errors. Here we employed a new method that induces sensory prediction errors without task performance errors. This method combines the use of clamped visual feedback that is angularly offset from the target and independent of the direction of motion, along with instructions to ignore this feedback while reaching to targets. Despite these instructions, participants unknowingly showed robust adaptation of their movements. This adaptation was similar to that observed with standard methods, showing sign dependence, local generalization, and cerebellar dependency. Surprisingly, adaptation rate and magnitude were invariant across a large range of offsets. Collectively, our results challenge current models of adaptation and demonstrate that behavior observed in many studies of adaptation reflect the composite effects of task performance and sensory prediction errors.
AB - Sensorimotor adaptation occurs when there is a discrepancy between the expected and actual sensory consequences of a movement. This learning can be precisely measured, but its source has been hard to pin down because standard adaptation tasks introduce two potential learning signals: task performance errors and sensory prediction errors. Here we employed a new method that induces sensory prediction errors without task performance errors. This method combines the use of clamped visual feedback that is angularly offset from the target and independent of the direction of motion, along with instructions to ignore this feedback while reaching to targets. Despite these instructions, participants unknowingly showed robust adaptation of their movements. This adaptation was similar to that observed with standard methods, showing sign dependence, local generalization, and cerebellar dependency. Surprisingly, adaptation rate and magnitude were invariant across a large range of offsets. Collectively, our results challenge current models of adaptation and demonstrate that behavior observed in many studies of adaptation reflect the composite effects of task performance and sensory prediction errors.
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U2 - 10.1162/jocn_a_01108
DO - 10.1162/jocn_a_01108
M3 - Article
C2 - 28195523
AN - SCOPUS:85018250583
SN - 0898-929X
VL - 29
SP - 1061
EP - 1074
JO - Journal of Cognitive Neuroscience
JF - Journal of Cognitive Neuroscience
IS - 6
ER -