GE CLST 73A Lecture Notes - Lecture 12: Edge Detection, Occipital Lobe, Visual Cortex
1 Nov 2016
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Read chapter 7 (not really the part about color) for this lecture/ article by purves. Function=use light energy to identify the objects & layout of physical world. Do not give us accurate picture of properties of light (wavelengths) --> creates useful representations. Effect of context on perception of brightness: mach bands: accentuate edges bc of their importance in identifying objects, ex. Kanizsa triangle: perceive triangle on top of black circles. Visual system responds to band of electromagnetic radiation. Energy has wavelength, & we are only sensitive to certain range of wavelengths (colors) We are sensitive to a huge range of brightness (amount of energy) Many species are sensitive to other wavelengths: bees can see uv light, many flowers have a center region that reflects uv light, allows bees to hone on the center of flower. Photoreceptor cells: rods & cones where transduction takes place.
