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Unformatted text preview: 2007-10-30•Read Chapter 5: page 156-203Duplex Theory of Vision•100 years old, but confirmed by modern research•Rods and cones handle distinct aspects of the visual task•Rods: night vision; low light; colourless – ‘achromatic’… but low acuity•Cones: day vision; require stronger light intensities; colour sensations – hi acuity•Lowest to strongest light sensitivity: 1-1x1011•The eye: hardly a perfectly designed cameraoWhat does this tell us about natural selection and evolution?•The photoreceptors – transforming light into neural signalsLaser Eye Surgery•LASIK surgeryoLaser assisted IN Situ Keratomileusis•Vaporizes tissue and reshapes cornea, and thus, its refractive power•Corrects short/far sightedness, astigmatism…•Some risks – halos and glareoUS-FDA site: www.mhhe.com/blake5Worsening Eye Problems•Likely a function of increasing inelasticity of lens…•Myopia (nearsightedness) worsens with years of ‘close’ work•Presbyopia happens with age in all peopleBrightness Contrast•What produces edge enhancement?•Mach bands…•Differences between contrasting brightness is enhanced by the visual systemoNeural activity in one area inhibits activity in a neighbouring area: lateral inhibition•Mach BandsLateral Inhibition and Contrast...
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This note was uploaded on 04/04/2009 for the course PSYCH 1000 taught by Professor Atkinson during the Spring '09 term at UWO.
- Spring '09