8_early_motor_dev - Prelim 1 Monday, February 23 during...

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1 1 Prelim 1 • Monday, February 23 –during normal class time/place • Review session –Thursday, Feb. 19, 7pm –Uris 202 • Review outline on Blackboard by Feb. 17 2 • Thelen (1992) –Trained as zoologist, using ethological approach • Stepping refex disappears, but kicking is kinematically identical! • What ±actors (“control parameters”) are infuencing the system o± leg coordination and movement? –Treadmill stepping in very young in±ants (1 - 4 mo) –water bath study -- stepping in three-month-olds (video) 2 Looking closely at walking 3 Dynamical systems approach • Walking seems to be assembled ±rom multiple components –Strength-to-weight ratio as a control parameter • Can manipulate system to create changes in developmental rate and timing o± stepping • Stable patterns emerge ±rom coactivity o± multiple components –Stability = equilibrium • CNS must act in concert with physical, biomechanical constaints
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2 4 Self-organization • Walking assembled from multiple components
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8_early_motor_dev - Prelim 1 Monday, February 23 during...

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