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Experimental Brain Research

, Volume 218, Issue 3, pp 341–359 | Cite as

Optimal feedback control and the long-latency stretch response

  • J. Andrew Pruszynski
  • Stephen H. Scott
Review

Abstract

There has traditionally been a separation between voluntary control processes and the fast feedback responses which follow mechanical perturbations (i.e., stretch “reflexes”). However, a recent theory of motor control, based on optimal control, suggests that voluntary motor behavior involves the sophisticated manipulation of sensory feedback. We have recently proposed that one implication of this theory is that the long-latency stretch “reflex”, like voluntary control, should support a rich assortment of behaviors because these two processes are intimately linked through shared neural circuitry including primary motor cortex. In this review, we first describe the basic principles of optimal feedback control related to voluntary motor behavior. We then explore the functional properties of upper-limb stretch responses, with a focus on how the sophistication of the long-latency stretch response rivals voluntary control. And last, we describe the neural circuitry that underlies the long-latency stretch response and detail the evidence that primary motor cortex participates in sophisticated feedback responses to mechanical perturbations.

Keywords

Reflex Optimal feedback control Long-latency Motor cortex Stretch response 

Notes

Acknowledgments

This work was funded by the Canadian Institute of Health Research (CIHR) and the National Science and Engineering Research Council of Canada (NSERC). J.A.P. received a salary award from the CIHR and the Human Frontier Science Program.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Centre for Neuroscience StudiesQueen’s UniversityKingstonCanada
  2. 2.Department of Biomedical and Molecular SciencesQueen’s UniversityKingstonCanada
  3. 3.Department of MedicineQueen’s UniversityKingstonCanada
  4. 4.Department of Integrative Medical Biology, Physiology SectionUmeå UniversityUmeaSweden

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