Movement vigor as a traitlike attribute of individuality

Journal of Neurophysiology
Thomas R ReppertReza Shadmehr

Abstract

A common aspect of individuality is our subjective preferences in evaluation of reward and effort. The neural circuits that evaluate these commodities influence circuits that control our movements, raising the possibility that vigor differences between individuals may also be a trait of individuality, reflecting a willingness to expend effort. In contrast, classic theories in motor control suggest that vigor differences reflect a speed-accuracy trade-off, predicting that those who move fast are sacrificing accuracy for speed. Here we tested these contrasting hypotheses. We measured motion of the eyes, head, and arm in healthy humans during various elementary movements (saccades, head-free gaze shifts, and reaching). For each person we characterized their vigor, i.e., the speed with which they moved a body part (peak velocity) with respect to the population mean. Some moved with low vigor, while others moved with high vigor. Those with high vigor tended to react sooner to a visual stimulus, moving both their eyes and arm with a shorter reaction time. Arm and head vigor were tightly linked: individuals who moved their head with high vigor also moved their arm with high vigor. However, eye vigor did not correspond strongly with ar...Continue Reading

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Citations

May 7, 2020·Journal of Neurophysiology·Tehrim YoonReza Shadmehr
Apr 11, 2020·Experimental Brain Research·Olivier CodolPeter J Holland
Jul 9, 2020·Journal of Neurophysiology·Amélie J ReynaudDavid Thura
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Sep 19, 2019·Journal of Neurophysiology·Harbandhan Kaur AroraJohn Douglas Crawford
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Oct 17, 2018·Proceedings of the National Academy of Sciences of the United States of America·Tehrim YoonReza Shadmehr
Nov 5, 2020·Journal of Neurophysiology·Jing WangSang Wook Lee

Related Concepts

Teens
Upper Arm
Kinematics
Individuality
Psychomotor Performance
Reaction Time
Rewards
Saccades
Head Movements
Decision Making

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