15-visual-functions

15-visual-functions - Psychology 3040/6014 Spring, 2008...

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Unformatted text preview: Psychology 3040/6014 Spring, 2008 FUNDAMENTAL VISUAL FUNCTIONS 1) Sensitivity a) Scotopic vs Photopic vision i) Scotopic ii) Photopic b) Dark adaptation i) Moving from light to dark ii) Chemical cycle of regeneration of rhodopsin c) Purkinje shift i) Rods react best to light of ~ 500 nm (blues) ii) Cones react best to light of ~550 nm (greens) iii) As vision shifts from photopic (cone) to scotopic (rod) vision, the sensitivity to different light wavelengths changes iv) Light at 500 nm (blue) becomes more bright (perceptually), and light at 550 nm (green) becomes less bright 1 of 5 Psychology 3040/6014 Spring, 2008 d) Red light for dark adaptation e) Thresholds i) Absolute thresholds (1) ~0.000001 mL ii) Riccos Law (1) C = A x I iii) Blochs Law (1) C = T x I iv) Flicker (1) CFF: critical flicker frequency 2 of 5 Psychology 3040/6014 Spring, 2008 2) Acuity a) Types i) Detection ii) Vernier iii) Resolution iv) Recognition v) Dynamic b) Visual angle i) As an object moves away, it needs to get bigger to maintain the same level of acuity (up to a point)...
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15-visual-functions - Psychology 3040/6014 Spring, 2008...

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