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Rapid Visuomotor Corrective Responses during Transport of Hand-Held Objects Incorporate Novel Object Dynamics
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
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2015 (English)In: Journal of Neuroscience, ISSN 0270-6474, E-ISSN 1529-2401, Vol. 35, no 29, 10572-10580 p.Article in journal (Refereed) Published
Abstract [en]

Numerous studies have shown that people are adept at learning novel object dynamics, linking applied force and motion, when performing reaching movements with hand-held objects. Here we investigated whether the control of rapid corrective arm responses, elicited in response to visual perturbations, has access to such newly acquired knowledge of object dynamics. Participants first learned to make reaching movements while grasping an object subjected to complex load forces that depended on the distance and angle of the hand from the start position. During a subsequent test phase, we examined grip and load force coordination during corrective arm movements elicited (within similar to 150 ms) in response to viewed sudden lateral shifts (1.5 cm) in target or object position. We hypothesized that, if knowledge of object dynamics is incorporated in the control of the corrective responses, grip force changes would anticipate the unusual load force changes associated with the corrective arm movements so as to support grasp stability. Indeed, we found that the participants generated grip force adjustments tightly coupled, both spatially and temporally, to the load force changes associated with the arm movement corrections. We submit that recently learned novel object dynamics are effectively integrated into sensorimotor control policies that support rapid visually driven arm corrective actions during transport of hand held objects.

Place, publisher, year, edition, pages
2015. Vol. 35, no 29, 10572-10580 p.
Keyword [en]
internal model, motor learning, object manipulation, reaching, visuomotor control
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URN: urn:nbn:se:umu:diva-107162DOI: 10.1523/JNEUROSCI.1376-15.2015ISI: 000358299500018PubMedID: 26203151OAI: diva2:851673
Available from: 2015-09-07 Created: 2015-08-19 Last updated: 2016-01-22Bibliographically approved

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