A Gain-Field Encoding of Limb Position and Velocity in the Internal Model of Arm Dynamics

DSpace/Manakin Repository

A Gain-Field Encoding of Limb Position and Velocity in the Internal Model of Arm Dynamics

Citable link to this page

 

 
Title: A Gain-Field Encoding of Limb Position and Velocity in the Internal Model of Arm Dynamics
Author: Hwang, Eun Jung; Donchin, Opher; Smith, Maurice A; Shadmehr, Reza

Note: Order does not necessarily reflect citation order of authors.

Citation: Hwang, 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.
Full Text & Related Files:
Abstract: Adaptability 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.
Published Version: doi:10.1371/journal.pbio.0000025
Other Sources: http://www.seas.harvard.edu/motorlab/Reprints/plos03.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:14071849
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters