lecture5-08 - Feedback and Feedforward Control Neural Basis...

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Feedback and Feedforward Control Neural Basis of Movement Control
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Role of Visual Feedback Question: why does error increase with speed? Note: 50 cm/sec = 5cm/100msec
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Schematic Representation of Feedback and Feed-forward Systems Eg: pursuit, reaching, grasping Eg: saccade, throwing Eye velocity=image velocity sensory retinal velocity Motor command delay Load/fatigue/current position wind Learnt motor command ballistic guided
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Consequences of loss of feedback on reaching Large fibre sensory neuropathy leads to loss of proprioceptive feedback from muscles Vision compensates for lack of proprioception Errors in direction,distance No vision or proprioception Normal: proprioception only
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Motor Programs
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Basic Movement Circuitry
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Pre-motor cortex Posterior parietal ctx Primary motor ctx Proprioceptive signals (muscles, joints) Spinal feedback: 30-50 msec 80 msec Target selection Muscle commands Cortico-spinal tract Initiation of movement Smoothness, timing Learning new skills
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lecture5-08 - Feedback and Feedforward Control Neural Basis...

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