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Effort, success, and nonuse determine arm choice
- Publication Year :
- 2015
- Publisher :
- American Physiological Society, 2015.
-
Abstract
- How do humans choose one arm or the other to reach single targets in front of the body? Current theories of reward-driven decisionmaking predict that choice results from a comparison of “action values,” which are the expected rewards for possible actions in a given state. In addition, current theories of motor control predict that in planning arm movements, humans minimize an expected motor cost that balances motor effort and endpoint accuracy. Here, we test the hypotheses that arm choice is determined by comparison of action values comprising expected effort and expected task success for each arm, as well as a handedness bias. Right-handed subjects, in either a large or small target condition, were first instructed to use each hand in turn to shoot through an array of targets and then to choose either hand to shoot through the same targets. Effort was estimated via inverse kinematics and dynamics. A mixed-effects logistic-regression analysis showed that, as predicted, both expected effort and expected success predicted choice, as did arm use in the preceding trial. Finally, individual parameter estimation showed that the handedness bias correlated with mean difference between right- and left-arm success, leading to overall lower use of the left arm. We discuss our results in light of arm nonuse in individuals' poststroke.
- Subjects :
- Male
Physiology
General Neuroscience
Motor control
Choice Behavior
Models, Biological
Functional Laterality
Biomechanical Phenomena
Young Adult
Logistic Models
Action (philosophy)
Psychophysics
Arm
Humans
Female
Psychology
Control of Movement
Social psychology
Psychomotor Performance
Front (military)
Cognitive psychology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....e99906a3f5ed5bd36652562a370a93dd