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September 14, 2009

Announcements

  • SfN - October 17-29
    • Look at other funding sources
    • Get a budget ($220 plane ticket)
  • Banff - November 8-13
    • Look at getting plane tickets
  • Look at Torrence's papers due by next week
  • Find the Vicon Key
  • Need to make an assesment on data storage
  • BUGGS is doing a carnival tomorrow.
  • Adobe CS 4 - be on the look-out.

Presentation

Julia

  • How does the nervous system affect the movement of the body?
    • Now try and look at how the mechanics of the body affect the nervous system!
  • How does stance width affect balance control?
    • Relevance: Parkinson's patients have a much narrower stance.
  • Do initial biomechanical conditions affect postural responses to maintain stability?
    • CoM is tightly controlled, because excursion is the same between narrow and wide stance (Henry et al 2000).
    • EMGs do not scale between stance widths for Parkinson patients.
      • Parkinson patients apply the same level of force for different stance widths
    • For Jeven's standard figure plot stiffness in a more readable format
    • Do feedback gains change between different stance configurations?
      • A prediction is that stance width will change the gains.
    • The EMG activity in TFL goes down with increasing stance width.
    • Peak CoM velocity and acceleration goes down with increasing stance width
  • Hypothesis: Balance control in standing can be modeled as feedback control of the CoM motion where the gains related to acceleration and velocity changes with initial biomechanical conditions (stance width).
    • Explicit model vs abstract model - both should ultimately lead to a similar result.
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