gibsons bottom up theory

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  • Gibsons bottom up theory (1979)
    • A01- optic array (changing patter of light that surrounds the active perceiver provides sufficient enough info for perception.
      • the optic flow- the further away something from the fixed point, the more rapid the apparent movement towards us.
      • the importance of movement. ecological aspects of perception- texture gradient. the role of invariants in perception- unchanging invariants supply us with info that is crucial for accurate perception
        • making sense of the optic array- reasonance is how we make sense of broadcast information.
          • affordance is the potential for action offered by objects; they afford opportunities for a particular action. the concept further links perception and movement.
          • purpose of perception is the detection of useful info.
    • A02- biological motion (johannson). time to contact- long jumoers/strides. innate perceptual abilities. gibsons theory can als explain visual illusions.
    • strengths- highlights richness of info in the optic array. however it cant explain situation and culture. ie blind people. how would an african know that a letter box affords posting letters?
    • IDA- nature/nurture - gregorys (nurture- ie experience), gibsons related t innate mechanisms (nature)
      • real world application- concept of affordance successfully applied to the development of autonomous robots.


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