Short-term plasticity of the visuomotor map during grasping movements in humans
Identifieur interne : 000686 ( Ncbi/Merge ); précédent : 000685; suivant : 000687Short-term plasticity of the visuomotor map during grasping movements in humans
Auteurs : Daniel S Fström ; Benoni B. EdinSource :
- Learning & Memory [ 1072-0502 ] ; 2005.
Abstract
During visually guided grasping movements, visual information is transformed into motor commands. This transformation is known as the “visuomotor map.” To investigate limitations in the short-term plasticity of the visuomotor map in normal humans, we studied the maximum grip aperture (MGA) during the reaching phase while subjects grasped objects of various sizes. The objects seen and the objects grasped were physically never the same. When a discrepancy had been introduced between the size of the visual and the grasped objects, and the subjects were fully adapted to it, they all readily interpolated and extrapolated the MGA to objects not included in training trials. In contrast, when the subjects were exposed to discrepancies that required a slope change in the visuomotor map, they were unable to adapt adequately. They instead retained a subject-specific slope of the relationship between the visual size and MGA. We conclude from these results that during reaching for grasping, normal subjects are unable to abandon a straight linear function determining the relationship between visual object size and MGA. Moreover, the plasticity of the visuomotor map is, at least in short term, constrained to allow only offset changes, that is, only “rigid shifts” are possible between the visual and motor coordinate systems.
Url:
DOI: 10.1101/lm.83005
PubMed: 15687231
PubMed Central: 548498
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PMC:548498Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>During visually guided grasping movements, visual information is transformed into motor commands. This transformation is known as the “visuomotor map.” To investigate limitations in the short-term plasticity of the visuomotor map in normal humans, we studied the maximum grip aperture (MGA) during the reaching phase while subjects grasped objects of various sizes. The objects seen and the objects grasped were physically never the same. When a discrepancy had been introduced between the size of the visual and the grasped objects, and the subjects were fully adapted to it, they all readily interpolated and extrapolated the MGA to objects not included in training trials. In contrast, when the subjects were exposed to discrepancies that required a slope change in the visuomotor map, they were unable to adapt adequately. They instead retained a subject-specific slope of the relationship between the visual size and MGA. We conclude from these results that during reaching for grasping, normal subjects are unable to abandon a straight linear function determining the relationship between visual object size and MGA. Moreover, the plasticity of the visuomotor map is, at least in short term, constrained to allow only offset changes, that is, only “rigid shifts” are possible between the visual and motor coordinate systems.</p>
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<pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Learn Mem</journal-id>
<journal-id journal-id-type="publisher-id">learnmem</journal-id>
<journal-title>Learning & Memory</journal-title>
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<article-categories><subj-group subj-group-type="heading"><subject>Research Papers</subject>
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<title-group><article-title>Short-term plasticity of the visuomotor map during grasping movements in humans</article-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Säfström</surname>
<given-names>Daniel</given-names>
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<xref ref-type="corresp" rid="cor1">1</xref>
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<contrib contrib-type="author"><name><surname>Edin</surname>
<given-names>Benoni B.</given-names>
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<aff id="N0x8a270a8.0x9b7e000">Physiology Section, Department of Integrative Medical Biology, Umeå University, S-901 87 Umeå, Sweden</aff>
<author-notes><fn id="cor1"><label>1</label>
<p> E-mail <email>Daniel.Safstrom@physiol.umu.se</email>
; fax 46 90 7866683. </p>
</fn>
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<pub-date pub-type="ppub"><month>1</month>
<year>2005</year>
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<volume>12</volume>
<issue>1</issue>
<fpage>67</fpage>
<lpage>74</lpage>
<history><date date-type="received"><day>1</day>
<month>3</month>
<year>2004</year>
</date>
<date date-type="accepted"><day>12</day>
<month>11</month>
<year>2004</year>
</date>
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<copyright-statement>Copyright © 2005, Cold Spring Harbor Laboratory Press</copyright-statement>
<copyright-year>2005</copyright-year>
<abstract><p>During visually guided grasping movements, visual information is transformed into motor commands. This transformation is known as the “visuomotor map.” To investigate limitations in the short-term plasticity of the visuomotor map in normal humans, we studied the maximum grip aperture (MGA) during the reaching phase while subjects grasped objects of various sizes. The objects seen and the objects grasped were physically never the same. When a discrepancy had been introduced between the size of the visual and the grasped objects, and the subjects were fully adapted to it, they all readily interpolated and extrapolated the MGA to objects not included in training trials. In contrast, when the subjects were exposed to discrepancies that required a slope change in the visuomotor map, they were unable to adapt adequately. They instead retained a subject-specific slope of the relationship between the visual size and MGA. We conclude from these results that during reaching for grasping, normal subjects are unable to abandon a straight linear function determining the relationship between visual object size and MGA. Moreover, the plasticity of the visuomotor map is, at least in short term, constrained to allow only offset changes, that is, only “rigid shifts” are possible between the visual and motor coordinate systems.</p>
</abstract>
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<notes><fn-group><fn><p>Article and publication are at http://www.learnmem.org/cgi/doi/10.1101/lm.83005.</p>
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