Psychology 2220A/B Lecture 16: Lecture 16 - Senses 3
25 Mar 2017
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Photons pass through cells at back of retina. 3 types of cones - sensitive to wide range of wave lengths. Central vision, detailed, colour, best in bright light. Rods; coarse vision, peripheral vision, black & white, better than cones in dim light. Blind spot no photo receptors (in different locations in each eye) Macula - dirty spot on retina extra pigment. Part of retina w greatest precision crisp (light hits receptors more directly) What you are looking at is processed in fovea but everything else is just seen. Cones mostly in fovea rods peak outside fovea. Best acuity is when directly looking at something. Eye movements: if whole retina densely packed w cones, we"d need a huge brain to process all the info. Solution; move the fovea around to extract info across the scene. Ppl move their eyes about 3-4x per second (230,000x / day) Dark adaptation = bleaching rods red ashlights don"t bleach rods.
