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PSL - Tweed - 1.docx

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Department
Physiology
Course
PSL300H1
Professor
All Professors
Semester
Fall

Description
PSL Study NotesFirst Professor Tweed lecture 2013Sensory processing is inference Senses guide behaviour for survival and reproduction Senses incompleteambiguous information so brain must inferInference is unconscious processes using 10 billion neurons efficiently Sensory input is ambiguousSelect the most plausible choice AssumptionsLight from aboveFaces are convexThese assumptions are not rigid one assumption can override another Based on experienceThe brain guesses based on experience but can be fooledfor example visual illusions Illusion does not disappear if you understand it The eye evolved independently 40 times Takes 05 million years to evolveSimplest cells are cups of lightsensitive cells so light at different places excite different cells Can infer where light is based on which cells are activedawn of inference Cup becomes pinhole by closing in the walls and creating pinhole Pinhole eye casts inverted images on back of eye Perfect focus by ensuring light from only one direction Simple eye light enters via smal
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