Comparative Neuromechanics Laboratory

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555 14th Street NW, room 1405
Phone:404-894-9993, 404-385-6489 (lab), Fax:404-894-9982

Research Interests

We are interested in studying how the neuromechanical complexity within a leg is coordinated and controlled to maintain stable function of the entire body. In particular, we are interested in how general compensation mechanisms used during steady state locomotion may be exploited to automatically respond to both acute and chronic deficits related to either mechanical or neuromuscular disabilities. More information

RonHopper

Personnel

Amputee Gait
  • Director: Young-Hui Chang, Ph.D.
  • Graduate Students (Ph.D.): Arick G. Auyang, Jay Bauman, Heather B. Hayes, Jasper T. Yen
  • Graduate Students (M.S.P.O.): Chris Fink, Kinsey Herrin, Megan Krause
  • Undergraduate Students: Heidi Kloefkorn, Ramya Parthasarathy, Hosna Sharafi, Maya Uddin
  • Collaborators:
    • Richard Nichols (GA Tech)
    • John P. Scholz (Univ. Delaware)
    • Shawn Hochman (Emory)
    • Lena Ting (Emory/GA Tech)
    • Timothy Cope (Wright State)
    • Aras Petrulis (Georgia State)

Current Research Projects

Joint-level contributions of interjoint coordination, passive mechanics and noise reduction for stabilizing leg function within a goal-equivalent task space during human locomotion. Preservation of limb function in human and non-human animal locomotion due to joint-level compensations after neuromechanical disruptions: peripheral nerve injury, lower limb amputation, and exoskeletal orthotic intervention. High-speed x-ray video analysis to determine kinematic correction algorithms for skin movement errors during rodent locomotion. Study of neural substrates for limb-level locomotor function within the rodent spinal cord during in vitro locomotion. Developmental changes in the control of postural stability during one-legged stance in Chilean flamingos.

Rat X-ray   Rat

Research Opportunities

Interested individuals who wish to work in the lab may contact Dr. Chang directly via e-mail for research opportunities. Undergraduates are encouraged to inquire, however, will be required to volunteer for one full semester before any consideration for course credit or pay will be given.

Funding

  • NIH NIAMS AR054760
  • ONR, Applied Research & Development Institute (pending, funding recommended)
  • NSF BCS-PAC CAREER Grant (pending, funding recommended)

Recent Publications

  • Hayes, H.B., Y.-H. Chang., and S. Hochman. An in vitro spinal cord-hindlimb preparation for studying behaviorally relevant rat locomotor function. J. Neurophysiology. In press.
  • Chang, Y.-H. Limb compensation strategies for controlling locomotor stability. In: “Advances in Neuromuscular Physiology of Motor Skills and Muscle Fatigue”. ed., M. Shinohara. Invited Book Chapter. In press.
  • Auyang, A., J. Yen, and Y.-H. Chang. Neuromechanical stabilization of leg length and orientation through interjoint compensation during human hopping. Exp. Brain Res., 192: 253-264, 2009.
  • Chang, Y.-H., Roiz, R.A., and A. Auyang. Intralimb compensation strategy depends on the nature of joint perturbation in human hopping. J. Biomechanics, 41(9): 1832-1839, 2008.
  • Yeom, H. J., Park, Y.C. and Y.-H. Chang. Eigen filter to detect volitional EMG signals in autogenic EMG-controlled FES. IEE Electronics Letters, 43(25): 1410-1411, 2007.
  • Chang, Y.-H. and R. Kram. Limitations to running speed on flat curves. J. Experimental Biology, 210:971-982, 2007.