Dale Purves: How Visual Evolution Determines What We See

<p>Oct 14, 2013 08:48 PM</p>

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1) we don't see the physical world.</p>

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eg perception of luminance &nbsp;(eg as measured by a photometer)

but changed by surround: &nbsp;black rectangle surrounding the large polka dot.

same with lighted block with stripes: &nbsp;some apparently light vs dark.</p>

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Tom Cornsweet edge effect: &nbsp;instantaneous; &nbsp;gray vs black on cube surfaces.</p>

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these are not "illusion"... just the way we see luminance.</p>

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2) &nbsp;the reason we don't see the real world is that visual stimul do not/ cannot

specify physical params &nbsp;(the inverse optics problem)</p>

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3) &nbsp;vision circumvents the inverse problem by actively creating stimuli limited to those that promote reproductive success.</p>

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