9 early motor&cog dev

9 early motor&cog dev - Looking closely at walking...

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2/21/11 1 1 • Thelen (1992) –Trained as zoologist, using ethological approach • Stepping refex disappears, but kicking is kinematically identical! • What Factors (“control parameters”) are infuencing the system oF leg coordination and movement? –Treadmill stepping in very young inFants (1 - 4 mo) –water bath study -- stepping in three-month-olds (video) 1 Looking closely at walking 2 Dynamical systems approach • Walking seems to be assembled From multiple components –Strength-to-weight ratio as a control parameter • Can manipulate system to create changes in developmental rate and timing oF stepping • Stable patterns emerge From coactivity oF multiple components –Stability = equilibrium • CNS must act in concert with physical, biomechanical constaints 3 SelF-organization • Walking assembled From multiple components • Patterns oF coordination are task-dependent • There is no “essence oF walking”
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2/21/11 2 4 Two views • The view from above: –Emphasize causes of stability
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9 early motor&cog dev - Looking closely at walking...

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