TY - JOUR
T1 - Alteration of a motor learning rule under mirror-reversal transformation does not depend on the amplitude of visual error
AU - Kasuga, Shoko
AU - Kurata, Makiko
AU - Liu, Meigen
AU - Ushiba, Junichi
N1 - Funding Information:
The authors thank Daichi Nozaki for helpful discussions. The authors thank all members of the Ushiba laboratory, especially Sayoko Ishii and Sawako Ohtaki for their assistance during the experiments. This study resulted from “Brain-Machine Interface Development” under the Strategic Research Program for Brain Sciences by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. This work was also supported by Grant-in-Aid for Young Scientists (B) (# 25750267 ), MEXT to SK.
Publisher Copyright:
© 2014 Elsevier Ireland Ltd and the Japan Neuroscience Society.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Human's sophisticated motor learning system paradoxically interferes with motor performance when visual information is mirror-reversed (MR), because normal movement error correction further aggravates the error. This error-increasing mechanism makes performing even a simple reaching task difficult, but is overcome by alterations in the error correction rule during the trials. To isolate factors that trigger learners to change the error correction rule, we manipulated the gain of visual angular errors when participants made arm-reaching movements with mirror-reversed visual feedback, and compared the rule alteration timing between groups with normal or reduced gain. Trial-by-trial changes in the visual angular error was tracked to explain the timing of the change in the error correction rule. Under both gain conditions, visual angular errors increased under the MR transformation, and suddenly decreased after 3-5 trials with increase. The increase became degressive at different amplitude between the two groups, nearly proportional to the visual gain. The findings suggest that the alteration of the error-correction rule is not dependent on the amplitude of visual angular errors, and possibly determined by the number of trials over which the errors increased or statistical property of the environment. The current results encourage future intensive studies focusing on the exact rule-change mechanism.
AB - Human's sophisticated motor learning system paradoxically interferes with motor performance when visual information is mirror-reversed (MR), because normal movement error correction further aggravates the error. This error-increasing mechanism makes performing even a simple reaching task difficult, but is overcome by alterations in the error correction rule during the trials. To isolate factors that trigger learners to change the error correction rule, we manipulated the gain of visual angular errors when participants made arm-reaching movements with mirror-reversed visual feedback, and compared the rule alteration timing between groups with normal or reduced gain. Trial-by-trial changes in the visual angular error was tracked to explain the timing of the change in the error correction rule. Under both gain conditions, visual angular errors increased under the MR transformation, and suddenly decreased after 3-5 trials with increase. The increase became degressive at different amplitude between the two groups, nearly proportional to the visual gain. The findings suggest that the alteration of the error-correction rule is not dependent on the amplitude of visual angular errors, and possibly determined by the number of trials over which the errors increased or statistical property of the environment. The current results encourage future intensive studies focusing on the exact rule-change mechanism.
KW - Arm-reaching
KW - Error history
KW - Error sensitivity
KW - Mirror-reversal transformation
KW - Visual gain
KW - Visuomotor learning
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U2 - 10.1016/j.neures.2014.12.010
DO - 10.1016/j.neures.2014.12.010
M3 - Article
C2 - 25561430
AN - SCOPUS:84927911249
VL - 94
SP - 62
EP - 69
JO - Neuroscience Research
JF - Neuroscience Research
SN - 0168-0102
ER -