Control of velocity and position in single joint movements
Identifieur interne : 001003 ( Pmc/Curation ); précédent : 001002; suivant : 001004Control of velocity and position in single joint movements
Auteurs : Pratik K. Mutha ; Robert L. SainburgSource :
- Human movement science [ 0167-9457 ] ; 2007.
Abstract
Previous research on single joint movements has lead to the development of models of control that propose that movement speed and distance are controlled through an initial pulsatile signal that can be modified in both amplitude and duration. However, the manner in which the amplitude and duration are modulated during the control of movement speed and distance remains controversial. We now report two studies that were designed to test and refine the pulse-step model of movement control. In our first study, participants move at a series of speeds to a single spatial target. In this task, acceleration duration (pulse-width) varied substantially across targets, and was negatively correlated with peak acceleration (pulse-height). In a second experiment, we removed the spatial target, but required movements at three speeds similar to those used in the first study. In this task, acceleration amplitude varied extensively across the speed targets, while acceleration duration remained constant across the three speeds. Taken together, our current findings demonstrate that pulse-width measures can be modulated independently from pulse-height measures, and that a positive correlation between such measures is not obligatory, even when sampled across a range of movement speeds. In addition, our findings suggest that pulse-height modulation plays a primary role in controlling movement speed and specifying target distance, whereas pulse-width mechanisms are employed to correct errors in pulse-height control, as required to achieve spatial precision in final limb position.
Url:
DOI: 10.1016/j.humov.2007.06.001
PubMed: 17931729
PubMed Central: 2607068
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<front><div type="abstract" xml:lang="en"><p id="P2">Previous research on single joint movements has lead to the development of models of control that propose that movement speed and distance are controlled through an initial pulsatile signal that can be modified in both amplitude and duration. However, the manner in which the amplitude and duration are modulated during the control of movement speed and distance remains controversial. We now report two studies that were designed to test and refine the pulse-step model of movement control. In our first study, participants move at a series of speeds to a single spatial target. In this task, acceleration duration (pulse-width) varied substantially across targets, and was negatively correlated with peak acceleration (pulse-height). In a second experiment, we removed the spatial target, but required movements at three speeds similar to those used in the first study. In this task, acceleration amplitude varied extensively across the speed targets, while acceleration duration remained constant across the three speeds. Taken together, our current findings demonstrate that pulse-width measures can be modulated independently from pulse-height measures, and that a positive correlation between such measures is not obligatory, even when sampled across a range of movement speeds. In addition, our findings suggest that pulse-height modulation plays a primary role in controlling movement speed and specifying target distance, whereas pulse-width mechanisms are employed to correct errors in pulse-height control, as required to achieve spatial precision in final limb position.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-journal-id">8300127</journal-id>
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<journal-id journal-id-type="nlm-ta">Hum Mov Sci</journal-id>
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<title-group><article-title>Control of velocity and position in single joint movements</article-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Mutha</surname>
<given-names>Pratik K.</given-names>
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<contrib contrib-type="author"><name><surname>Sainburg</surname>
<given-names>Robert L.</given-names>
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<aff id="A1">The Pennsylvania State University, University Park, PA-16802</aff>
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<author-notes><corresp id="FN1">Corresponding author: Dr. Robert L. Sainburg, Department of Kinesiology, 29, Recreation Building, The Pennsylvania State University, University Park, PA, 16802, USA, Tel : 814-865-7938, Fax : 814-865-7937</corresp>
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<pub-date pub-type="nihms-submitted"><day>28</day>
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<year>2007</year>
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<pub-date pub-type="ppub"><month>12</month>
<year>2007</year>
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<pub-date pub-type="pmc-release"><day>23</day>
<month>12</month>
<year>2008</year>
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<volume>26</volume>
<issue>6</issue>
<fpage>808</fpage>
<lpage>823</lpage>
<abstract><p id="P2">Previous research on single joint movements has lead to the development of models of control that propose that movement speed and distance are controlled through an initial pulsatile signal that can be modified in both amplitude and duration. However, the manner in which the amplitude and duration are modulated during the control of movement speed and distance remains controversial. We now report two studies that were designed to test and refine the pulse-step model of movement control. In our first study, participants move at a series of speeds to a single spatial target. In this task, acceleration duration (pulse-width) varied substantially across targets, and was negatively correlated with peak acceleration (pulse-height). In a second experiment, we removed the spatial target, but required movements at three speeds similar to those used in the first study. In this task, acceleration amplitude varied extensively across the speed targets, while acceleration duration remained constant across the three speeds. Taken together, our current findings demonstrate that pulse-width measures can be modulated independently from pulse-height measures, and that a positive correlation between such measures is not obligatory, even when sampled across a range of movement speeds. In addition, our findings suggest that pulse-height modulation plays a primary role in controlling movement speed and specifying target distance, whereas pulse-width mechanisms are employed to correct errors in pulse-height control, as required to achieve spatial precision in final limb position.</p>
</abstract>
<kwd-group><kwd>Pulse-step model</kwd>
<kwd>trajectory control</kwd>
<kwd>position control</kwd>
</kwd-group>
<contract-num rid="HD1">R01 HD039311-06A2</contract-num>
<contract-sponsor id="HD1">National Institute of Child Health & Human Development : NICHD</contract-sponsor>
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