Journal article
Rapid Correction of Aimed Movements by Summation of Force-Field Primitives
The Journal of neuroscience, v 20(1), pp 409-426
01 Jan 2000
PMID: 10627617
Abstract
Spinal circuits form building blocks for movement construction. In the frog, such building blocks have been described as isometric force fields. Microstimulation studies showed that individual force fields can be combined by vector summation. Summation and scaling of a few force-field types can, in theory, produce a large range of dynamic force-field structures associated with limb behaviors. We tested for the first time whether force-field summation underlies the construction of real limb behavior in the frog. We examined the organization of correction responses that circumvent path obstacles during hindlimb wiping trajectories. Correction responses were triggered on-line during wiping by cutaneous feedback signaling obstacle collision. The correction response activated a force field that summed with an ongoing sequence of force fields activated during wiping. Both impact force and time of impact within the wiping motor pattern scaled the evoked correction response amplitude. However, the duration of the correction response was constant and similar to the duration of other muscles activated in different phases of wiping. Thus, our results confirm that both force-field summation and scaling occur during real limb behavior, that force fields represent fixed-timing motor elements, and that these motor elements are combined in chains and in combination contingent on the interaction of feedback and central motor programs.
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Details
- Title
- Rapid Correction of Aimed Movements by Summation of Force-Field Primitives
- Creators
- William J KargoSimon F Giszter
- Publication Details
- The Journal of neuroscience, v 20(1), pp 409-426
- Publisher
- Society for Neuroscience
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy
- Web of Science ID
- WOS:000084581800048
- Scopus ID
- 2-s2.0-0033999622
- Other Identifier
- 991014878196904721
InCites Highlights
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- Web of Science research areas
- Neurosciences