walking_w11

walking_w11 - Movement! 1 Learning to move: the typical...

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Movement! 1
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Learning to move: the typical sequence. Dramatic changes in posture. 2 How do infants learn to walk?
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Walking “... The upright two-footed locomotion of the human being seems almost a recipe for disaster in itself, and demands a remarkable control to make it practicable” From Pinker, 1997 Walking requires sophisticated internal “control” program Why? How does the program develop? To see necessity of program, let’s see what happens during walking. 3
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What goes on during walking Walking Highly coordinated series of falls Coordination of 200 skeletal muscles Back muscles prevent forward fall Abdnominal muscles prevent backward fall 30 muscles to move one leg and move forward. 4
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Walking “Walks are very complex. Not only do the feet have to move across the ground, but the hips, spine, arms, shoulders and head all move in sync to maintain balance in the system .” From rubberbug.com, a DIY animation website. 5
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6 Center of gravity goes up and down, and left and right. Very fragile balance! Each leg alternates between taking full weight of body and moving freely.
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7 Each hip sways backwards and forwards As change support leg, sway left and right.
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Our gait adapts rapidly to new situations. 8 We are able to use perceptual information to adapt our gait on-line.
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What happens during walking: summary Multiple parts moving in sync Maintain balance while body changes constantly Supporting leg alternates between left and right Center of gravity goes up and down and left and right Hips sway backwards and forwards Make on-line adjustments based on perceptual information Ice, sand, narrow surface, etc… 9
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Why there must be a program that controls walking. The program or “conductor”
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walking_w11 - Movement! 1 Learning to move: the typical...

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