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Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks
Several studies have shown that human motor behavior can be successfully described using optimal control theory, which describes behavior by optimizing the trade-off between the subject's effort and performance. This approach predicts that subjects reach the goal exactly at the final time. Howe...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312345/ https://www.ncbi.nlm.nih.gov/pubmed/22470464 http://dx.doi.org/10.1371/journal.pone.0033724 |
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author | Tramper, Julian J. van den Broek, Bart Wiegerinck, Wim Kappen, Hilbert J. Gielen, Stan |
author_facet | Tramper, Julian J. van den Broek, Bart Wiegerinck, Wim Kappen, Hilbert J. Gielen, Stan |
author_sort | Tramper, Julian J. |
collection | PubMed |
description | Several studies have shown that human motor behavior can be successfully described using optimal control theory, which describes behavior by optimizing the trade-off between the subject's effort and performance. This approach predicts that subjects reach the goal exactly at the final time. However, another strategy might be that subjects try to reach the target position well before the final time to avoid the risk of missing the target. To test this, we have investigated whether minimizing the control effort and maximizing the performance is sufficient to describe human motor behavior in time-constrained motor tasks. In addition to the standard model, we postulate a new model which includes an additional cost criterion which penalizes deviations between the position of the effector and the target throughout the trial, forcing arrival on target before the final time. To investigate which model gives the best fit to the data and to see whether that model is generic, we tested both models in two different tasks where subjects used a joystick to steer a ball on a screen to hit a target (first task) or one of two targets (second task) before a final time. Noise of different amplitudes was superimposed on the ball position to investigate the ability of the models to predict motor behavior for different levels of uncertainty. The results show that a cost function representing only a trade-off between effort and accuracy at the end time is insufficient to describe the observed behavior. The new model correctly predicts that subjects steer the ball to the target position well before the final time is reached, which is in agreement with the observed behavior. This result is consistent for all noise amplitudes and for both tasks. |
format | Online Article Text |
id | pubmed-3312345 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-33123452012-04-02 Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks Tramper, Julian J. van den Broek, Bart Wiegerinck, Wim Kappen, Hilbert J. Gielen, Stan PLoS One Research Article Several studies have shown that human motor behavior can be successfully described using optimal control theory, which describes behavior by optimizing the trade-off between the subject's effort and performance. This approach predicts that subjects reach the goal exactly at the final time. However, another strategy might be that subjects try to reach the target position well before the final time to avoid the risk of missing the target. To test this, we have investigated whether minimizing the control effort and maximizing the performance is sufficient to describe human motor behavior in time-constrained motor tasks. In addition to the standard model, we postulate a new model which includes an additional cost criterion which penalizes deviations between the position of the effector and the target throughout the trial, forcing arrival on target before the final time. To investigate which model gives the best fit to the data and to see whether that model is generic, we tested both models in two different tasks where subjects used a joystick to steer a ball on a screen to hit a target (first task) or one of two targets (second task) before a final time. Noise of different amplitudes was superimposed on the ball position to investigate the ability of the models to predict motor behavior for different levels of uncertainty. The results show that a cost function representing only a trade-off between effort and accuracy at the end time is insufficient to describe the observed behavior. The new model correctly predicts that subjects steer the ball to the target position well before the final time is reached, which is in agreement with the observed behavior. This result is consistent for all noise amplitudes and for both tasks. Public Library of Science 2012-03-21 /pmc/articles/PMC3312345/ /pubmed/22470464 http://dx.doi.org/10.1371/journal.pone.0033724 Text en Tramper et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Tramper, Julian J. van den Broek, Bart Wiegerinck, Wim Kappen, Hilbert J. Gielen, Stan Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks |
title | Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks |
title_full | Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks |
title_fullStr | Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks |
title_full_unstemmed | Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks |
title_short | Time-Integrated Position Error Accounts for Sensorimotor Behavior in Time-Constrained Tasks |
title_sort | time-integrated position error accounts for sensorimotor behavior in time-constrained tasks |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312345/ https://www.ncbi.nlm.nih.gov/pubmed/22470464 http://dx.doi.org/10.1371/journal.pone.0033724 |
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