BIO SCI 38 Lecture Notes - Lecture 17: Optical Flow, Two-Streams Hypothesis, Face Perception
5 Sep 2016
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Document Summary
Our brain has evolved for a very different world than the one we live in now: hunting animals or whatev, to office jobs. Our ancestors lived in a very dangerous world and had to make quick decisions to survive. We evolve innate rules, assumptions and short-cuts to help us quickly decide in a hostile environment. Your brain creates the contours of objects: i. e. demo of illusory contours, triangles within triangles with no lines, but we can still see it. The context of the visual scene influences perception. Sensation in phantom limbs: our brain can construct any feeling in any body part, even if that part is amputated. Unusual perception: synesthesia: the brain can also construct some unusual perception in some (otherwise normal) individuals, despite the variety of synesthesia cases, there are some common features: They are elementary (warm-cool, jagged-smooth, bright-dark, not pictoral or elaborate) and very specific (i. e. some subjects can identify the very precise color they see)
