small receptive fields at PR, small part of image, as it progresses through the visual system the image gets bigger until it combines to a whole
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What RF do PR have?
circular - very position sensitive
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ganglion cells
centre surround - position sensitive - size
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lgn
centre surround - position sensitive - size
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v1
striped - orientation sensitive - size + position
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v4
curved - sensitive to curvature - due to closely aligned differently orientated V1 RF combining - good at recognising faces and objects
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explain the Craik-consweet Obrian effect
retinal ganglion cells only recognise edges - they use edge info to fill the rest of the pic in - th edge is lighter on one side then the other- the brain fills this out as lighter on one sidde than another even tho the fill is the same - mans face
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