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lecture11-08 - Visuo-Motor Relationships Plasticity and...

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Visuo-Motor Relationships: Plasticity and Development
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Problem of sensory-motor coordination : How do we relate the visual and motor worlds? For reaching, a visual signal about location must be transformed into a command to the arm and hand muscles. This is not innate, but must be learnt during development.
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Development of reaching Within first 2 weeks, already directing arm towards objects. Some crude control of reach direction. Improves by the 5th month; consistently touch targets. Won’t reach for targets beyond arm’s length. Catching and anticipating target motion at 6 months. Distance accuracy develops more slowly, improving by 7 months.
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QuickTime( and a TIFF (LZW) decompressor are needed to see this picture. Increased use of visual feedback between 5 and 11 months
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More evidence that visuo-motor coordination must be learnt during development. Evidence: kittens given visual experience without opportunity for movement, and motor experience without vision, don’t learn how to control their movements using vision. Correlating the two is necessary (Held & Hein study).
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Held & Hein Role of Experience in Development of Visuo-motor coordination
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