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lecture9-08 - Visuo-Motor Relationships Plasticity and...

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Visuo-Motor Relationships: Plasticity and Development
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Demonstration: plasticity in relationship between vision and movements
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Ability to adapt to new relationships requires cerebellum
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Why do we need to retain plasticity for new visuo-motor relationships? 1. Need to adjust to changes in body size during development. 2. Need to adjust to damage/aging. 3. Need to adjust to environmental changes eg ice, loads etc. 4. Need to learn arbitrary mappings for tool use etc. 5. Need to acquire new motor skills. 6. Visuo-motor coordination is a computationally difficult problem for the brain. Need flexibility to correct errors.
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Straight hand paths People move their hand in a straight path even when they can’t see their hand motion, and so can only rely on proprioception.
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Straight hand paths Paths are straight even when the arm is loaded. Even when the arm is perturbed by forces acting on it, people learn to make straight hand paths.
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Grasping Reaching and grasping actions require close coordination, but depend on different kinds of visual information... Reaching: egocentric (where is object relative to me) Transform visual information about object location into movement direction. Grasping: object-centred Transform visual information about object properties (shape and size) into commands for grasping movements.
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Development of reaching Within first 2 weeks, already directing arm towards objects.
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