chapter 5 Sensation & Perception

All wavelengths but specific ones are most sensitive

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Unformatted text preview: - Rods and cones depend on wavelength of the light Rods have higher sensitivity to all spectrums except for red Cones are sensitive in low illumination to greenish ­yellow range - Dark Adaptation is the progressive improvement in brightness sensitivity that occur over time in low light After absorbing a light, the photoreceptor is depleted to receptor molecules for a period of time When you go from bright to dark, a large amount of photopigment will be depleted During dark adaptation, the photopigments are regenerated and the receptor's sensitivity increases greatly Fig. 5.8, graph of vision abilities in the dark of rods and cones vs time - Fighter pilots often work in a red room to allow their rods to be in dark adaptation so they can be ready to take off in the dark at any given time ColourVision Trichromatic Theory - Any color combination can be created by a mixture of blue, green, and red (additive color mixture) - Trichromatic theory claims that the eye perceives red, green, and blue in different intensities and mixes them together to generate a color Cones are sensitive to all wavelengths, but specific ones are most sensitive to one of the 3 colors - Theory inconsistent because it claims that yellow is made by red and green receptors, but people who are red green color blind are able to experience yellow - Also, it doesn't explain after image (a different color after you look away) Opponent process theory - Each of the 3 different types of cones respond to 2 different wavelengths 1. Red or green 2. Blue or yellow 3. Black or white - Explains after image, because the afterimage is opposite the color of the original Dual Process in Colour Transduction - Combination of trichromatic and opponent process theory - The trichromatic theory is right about the property of cones - The opponent process theory is partially correct (???) Color deficient vision - 7% of males and 1% of females have red ­green or yellow blue color systems AnalysisandReconstructionofVisualScenes Feature Detectors - Input is routed to the thalamus which routes the signal to the primary visual cortex in Psych 1000 My Notes Page 31 - Input is route...
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This document was uploaded on 02/26/2014 for the course PSYCHO 1000 at UWO.

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