PSYB57H3 Chapter Notes - Chapter 5: Retinal Ganglion Cell, Lateral Geniculate Nucleus, Trichromacy
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Several problems must be solved in order to go from physical wavelengths to the perception of color. Moreover, we want those perceived colour to go with the object (blood is red) and not to change dramatically as the viewing condition change (blood should remain red in a sun and shadow, for example) The cones that have a peak at about 420nm are known as short-wavelength cones (s-cones for short). The middle wave-length cones (m-cones) peak at about 535nm, and long wavelength cones (l-cones) peak at about 565nm. Remember also that cones work at daylight (photopic) light levels. We have one type of rod photoreceptor; it works in dimmer (scotopic) light and has a somewhat different sensitivity profile, peaking at about 500nm. S-cone: a cone that is preferentially sensitive to short wavelengths; known as. L-cone: a cone that is preferentially sensitive to long wavelengths, known as. Photopic: referring to light intensities that are bright enough to stimulate the.
