PSYCH 1XX3 Chapter Notes - Chapter 6: Fluorescent Lamp, Color Vision, Achromatopsia
4 Mar 2017
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Document Summary
The composition of a wavelength reflected from the object is determined not only by its reflectance but by the wavelength composition of the illuminating light. Light from incandescent bulbs is very yellow compared to the blue light of fluorescent light bulb or the dull light of a cloudy day. Colour constancy: our colour vision corrects for the variation in the overall illumination so the object"s colour appears about the same. Yellow banana will still look yellow on a cloudy day, or in a dimly lit room or even under bright light. Humans, bees and macaque monkeys are all trichromats. Goldfish, pigeons and ducks contain four types of retinal receptors. Rabbits, cats and squirrels are dichromats - only have two cone types. Monochromats lack colour vision entirely. (use brightness and contrast only) Blue activates short wavelength receptors, but weak activation of other receptors. Yellow light activates medium and short wavelength receptors.
