Effect of Arm Dominance on Long-Latency Stabilizing Reflex Gain during Posture Elise H. E. Walker Eric J. Perreault Northwestern University & Rehabilitation Institute of Chicago EMBC 2014, Chicago IL USA | Thursday, August 28 | Motor Learning and Neural Control II 1
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EMBC 2014, Chicago IL USA | Thursday, August 28 | Motor Learning and Neural Control II 1
Effect of Arm Dominance on Long-Latency Stabilizing Reflex Gain during Posture
Elise H. E. WalkerEric J. Perreault
Northwestern University &Rehabilitation Institute of Chicago
EMBC 2014, Chicago IL USA | Thursday, August 28 | Motor Learning and Neural Control II 2
Arm dominance as control specialization in the cortical hemispheres
__DOMINANT__ • Predictive
• Trajectory
• Limb dynamics
• Reach initiation
NONDOMINANT• Impedance
• Position
• Stabilizing
• Final position
Bagesteiro & Sainburg, J Neurophys 2002“Handedness: dominant arm advantages in control of limb dynamics”
Bagesteiro & Sainburg, J Neurophys 2003“Nondominant arm advantages in load compensation during rapid elbow joint movements”
Mani, Mutha, Przybyla, Haaland, Good, Sainburg, Brain 2013“Contralesional motor deficits after unilateral stroke reflect hemiphere-specific control mechanisms”
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EMBC 2014, Chicago IL USA | Thursday, August 28 | Motor Learning and Neural Control II 3
Modified from Shemmell et al. 2009 J Neurosci 29(42)
Time (ms)PTB
0.1 mV
-50 0 50 100 150
Bice
ps E
MG
Stiff DNICompliant DNI
Stabilizing stretch reflexes: task-appropriate feedback responses during posture
Hypothesis: Nondominant arm will display more effective stabilizing
stretch reflex
LLR
EMBC 2014, Chicago IL USA | Thursday, August 28 | Motor Learning and Neural Control II 4