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This is an incredible lecture by a brilliant scientist who uses recent theoretical breakthroughs in several fields to construct a model to elegantly explain a common neurovisual phenomenon.
Very highly recommended. The math is definitely pretty advanced, but if you're patient and have a basic grasp of some of the mathematical concepts you can get a lot out of it.
The basic thesis is that the brain is pre-wired to produce in the visual field, particularly under exceptional conditions, a finite array of visual forms.