Control of an unstable load using visual feedback

Daniel Ludvig*, Yong Zhao, Robert E. Kearney

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Joint stiffness defines the dynamic relationship between the position of the joint and the torque acting about it. Joint stiffness is viewed as consisting of two components: reflex and intrinsic stiffness. However, when subjects attempt to maintain the position of a joint constant, such as in upright stance, voluntary torque will contribute to the measured joint stiffness. This voluntary torque may arise from visual, vestibular and proprioceptive sources. In this study, subjects were given the task of maintaining the position of a large inertial load constant, using only visual feedback. We found that subjects produced torques which were delayed, low-pass filtered versions of the load velocity. We also showed that the use of velocity information is critical, because it is not possible to stabilize the system without it.

Original languageEnglish (US)
Title of host publicationProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
Pages2489-2492
Number of pages4
StatePublished - Dec 1 2008
Event30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - Vancouver, BC, Canada
Duration: Aug 20 2008Aug 25 2008

Publication series

NameProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology"

Other

Other30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
CountryCanada
CityVancouver, BC
Period8/20/088/25/08

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Signal Processing
  • Biomedical Engineering
  • Health Informatics

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