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dc.contributor.authorHwang, Eun Jung
dc.contributor.authorDonchin, Opher
dc.contributor.authorSmith, Maurice A
dc.contributor.authorShadmehr, Reza
dc.date.accessioned2015-03-03T19:36:34Z
dc.date.issued2003
dc.identifier.citationHwang, Eun Jung, Opher Donchin, Maurice A. Smith, and Reza Shadmehr. 2003. “A Gain-Field Encoding of Limb Position and Velocity in the Internal Model of Arm Dynamics.” PLoS Biology 1 (2): e5. doi:10.1371/journal.pbio.0000025.en_US
dc.identifier.issn1544-9173en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:14071849
dc.description.abstractAdaptability of reaching movements depends on a computation in the brain that transforms sensory cues, such as those that indicate the position and velocity of the arm, into motor commands. Theoretical consideration shows that the encoding properties of neural elements implementing this transformation dictate how errors should generalize from one limb position and velocity to another. To estimate how sensory cues are encoded by these neural elements, we designed experiments that quantified spatial generalization in environments where forces depended on both position and velocity of the limb. The patterns of error generalization suggest that the neural elements that compute the transformation encode limb position and velocity in intrinsic coordinates via a gain-field; i.e., the elements have directionally dependent tuning that is modulated monotonically with limb position. The gain-field encoding makes the counterintuitive prediction of hypergeneralization: there should be growing extrapolation beyond the trained workspace. Furthermore, nonmonotonic force patterns should be more difficult to learn than monotonic ones. We confirmed these predictions experimentally.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherPublic Library of Science (PLoS)en_US
dc.relation.isversionofdoi:10.1371/journal.pbio.0000025en_US
dc.relation.hasversionhttp://www.seas.harvard.edu/motorlab/Reprints/plos03.pdfen_US
dash.licenseLAA
dc.titleA Gain-Field Encoding of Limb Position and Velocity in the Internal Model of Arm Dynamicsen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalPlos Biologyen_US
dash.depositing.authorSmith, Maurice A
dc.date.available2015-03-03T19:36:34Z
dc.identifier.doi10.1371/journal.pbio.0000025*
dash.contributor.affiliatedSmith, Maurice


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