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• W2056565202 abstract "The minimum variance theory proposes that motor commands are corrupted by signal-dependent noise and smooth trajectories with low noise levels are selected to minimize endpoint error and endpoint variability. The purpose of the study was to determine the contribution of trajectory smoothness to the endpoint accuracy and endpoint variability of rapid multi-joint arm movements. Young and older adults performed arm movements (4 blocks of 25 trials) as fast and as accurately as possible to a target with the right (dominant) arm. Endpoint accuracy and endpoint variability along with trajectory smoothness and error were quantified for each block of trials. Endpoint error and endpoint variance were greater in older adults compared with young adults, but decreased at a similar rate with practice for the two age groups. The greater endpoint error and endpoint variance exhibited by older adults were primarily due to impairments in movement extent control and not movement direction control. The normalized jerk was similar for the two age groups, but was not strongly associated with endpoint error or endpoint variance for either group. However, endpoint variance was strongly associated with endpoint error for both the young and older adults. Finally, trajectory error was similar for both groups and was weakly associated with endpoint error for the older adults. The findings are not consistent with the predictions of the minimum variance theory, but support and extend previous observations that movement trajectories and endpoints are planned independently." @default.
• W2056565202 created "2016-06-24" @default.
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• W2056565202 date "2013-06-01" @default.
• W2056565202 modified "2023-10-14" @default.
• W2056565202 title "Movement trajectory smoothness is not associated with the endpoint accuracy of rapid multi-joint arm movements in young and older adults" @default.
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• W2056565202 doi "https://doi.org/10.1016/j.actpsy.2013.02.011" @default.
• W2056565202 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3677705" @default.
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