TY - GEN
T1 - Control of an unstable load using visual feedback
AU - Ludvig, Daniel
AU - Zhao, Yong
AU - Kearney, Robert E.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - 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.
AB - 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.
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M3 - Conference contribution
C2 - 19163208
AN - SCOPUS:61849142892
SN - 9781424418152
T3 - Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology"
SP - 2489
EP - 2492
BT - Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
T2 - 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
Y2 - 20 August 2008 through 25 August 2008
ER -