Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands
The remarkable ability of the motor system to adapt to novel environments has traditionally been investigated using kinematically non-redundant tasks, such as planar reaching movements. This limitation prevents the study of how the motor system achieves adaptation by altering the movement patterns o...
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eLife Sciences Publications Ltd
2024-11-01
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| Series: | eLife |
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| Online Access: | https://elifesciences.org/articles/96665 |
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| author | Toshiki Kobayashi Daichi Nozaki |
| author_facet | Toshiki Kobayashi Daichi Nozaki |
| author_sort | Toshiki Kobayashi |
| collection | DOAJ |
| description | The remarkable ability of the motor system to adapt to novel environments has traditionally been investigated using kinematically non-redundant tasks, such as planar reaching movements. This limitation prevents the study of how the motor system achieves adaptation by altering the movement patterns of our redundant body. To address this issue, we developed a redundant motor task in which participants reached for targets with the tip of a virtual stick held with both hands. Despite the redundancy of the task, participants consistently employed a stereotypical strategy of flexibly changing the tilt angle of the stick depending on the direction of tip movement. Thus, this baseline relationship between tip-movement direction and stick-tilt angle constrained both the physical and visual movement patterns of the redundant system. Our task allowed us to systematically investigate how the motor system implicitly changed both the tip-movement direction and the stick-tilt angle in response to imposed visual perturbations. Both types of perturbations, whether directly affecting the task (tip-movement direction) or not (stick-tilt angle around the tip), drove adaptation, and the patterns of implicit adaptation were guided by the baseline relationship. Consequently, tip-movement adaptation was associated with changes in stick-tilt angle, and intriguingly, even seemingly ignorable stick-tilt perturbations significantly influenced tip-movement adaptation, leading to tip-movement direction errors. These findings provide a new understanding that the baseline relationship plays a crucial role not only in how the motor system controls movement of the redundant system, but also in how it implicitly adapts to modify movement patterns. |
| format | Article |
| id | doaj-art-f0561c9a1e5e414cbee53f49832e4d11 |
| institution | Kabale University |
| issn | 2050-084X |
| language | English |
| publishDate | 2024-11-01 |
| publisher | eLife Sciences Publications Ltd |
| record_format | Article |
| series | eLife |
| spelling | doaj-art-f0561c9a1e5e414cbee53f49832e4d112024-11-27T17:41:08ZengeLife Sciences Publications LtdeLife2050-084X2024-11-011310.7554/eLife.96665Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both handsToshiki Kobayashi0Daichi Nozaki1https://orcid.org/0000-0002-1338-8337Graduate School of Education, The University of Tokyo, Tokyo, Japan; Japan Society for the Promotion of Science, Tokyo, JapanGraduate School of Education, The University of Tokyo, Tokyo, JapanThe remarkable ability of the motor system to adapt to novel environments has traditionally been investigated using kinematically non-redundant tasks, such as planar reaching movements. This limitation prevents the study of how the motor system achieves adaptation by altering the movement patterns of our redundant body. To address this issue, we developed a redundant motor task in which participants reached for targets with the tip of a virtual stick held with both hands. Despite the redundancy of the task, participants consistently employed a stereotypical strategy of flexibly changing the tilt angle of the stick depending on the direction of tip movement. Thus, this baseline relationship between tip-movement direction and stick-tilt angle constrained both the physical and visual movement patterns of the redundant system. Our task allowed us to systematically investigate how the motor system implicitly changed both the tip-movement direction and the stick-tilt angle in response to imposed visual perturbations. Both types of perturbations, whether directly affecting the task (tip-movement direction) or not (stick-tilt angle around the tip), drove adaptation, and the patterns of implicit adaptation were guided by the baseline relationship. Consequently, tip-movement adaptation was associated with changes in stick-tilt angle, and intriguingly, even seemingly ignorable stick-tilt perturbations significantly influenced tip-movement adaptation, leading to tip-movement direction errors. These findings provide a new understanding that the baseline relationship plays a crucial role not only in how the motor system controls movement of the redundant system, but also in how it implicitly adapts to modify movement patterns.https://elifesciences.org/articles/96665reaching movementredundancybimanual movementmotor learning |
| spellingShingle | Toshiki Kobayashi Daichi Nozaki Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands eLife reaching movement redundancy bimanual movement motor learning |
| title | Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands |
| title_full | Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands |
| title_fullStr | Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands |
| title_full_unstemmed | Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands |
| title_short | Implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands |
| title_sort | implicit motor adaptation patterns in a redundant motor task manipulating a stick with both hands |
| topic | reaching movement redundancy bimanual movement motor learning |
| url | https://elifesciences.org/articles/96665 |
| work_keys_str_mv | AT toshikikobayashi implicitmotoradaptationpatternsinaredundantmotortaskmanipulatingastickwithbothhands AT daichinozaki implicitmotoradaptationpatternsinaredundantmotortaskmanipulatingastickwithbothhands |