| Colored context cues can facilitate the ability to learn and to switch between multiple dynamical force fields. | |
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MedLine Citation:
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PMID: 21490278 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We tested the efficacy of color context cues during adaptation to dynamic force fields. Four groups of human subjects performed elbow flexion/extension movements to move a cursor between targets on a monitor while encountering a resistive (Vr) or assistive (Va) viscous force field. They performed two training sets of 256 trials daily, for 10 days. The monitor color changed (red, green) every four successful trials, but provided different degrees of force-field context information to each group. Group 1 & 2: Irrelevant cues : the color changed every four trials, but Group 1 encountered only the Va field and Group 2 only the Vr field. Group 3: Reliable cues: the force field alternated between Va and Vr each time the monitor changed color (Vr: red; Va: green). Group 4: Unreliable cues: the force field changed between Va and Vr pseudo-randomly at each color change. Subjects in all Groups made increasingly stereotyped movements over 10 training days. Group 3 typically learned the association between color cues and fields and began to make predictive changes in motor output at each color change during the first day. Their performance continued to improve over the remaining days. Performance of Group 4 subjects also improved across training days, but developed a strategy of probing the nature of the field at each color change by emitting a default motor response and then adjusting their motor output in subsequent trials. These findings show that subjects can extract explicit and implicit information from color context cues during force-field adaptation. |
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Authors:
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Touria Addou; Nedialko I Krouchev; John F Kalaska |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-13 |
Journal Detail:
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Title: Journal of neurophysiology Volume: - ISSN: 1522-1598 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Université de Montréal. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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