PSYCH 2E03 Lecture Notes - Lecture 28: Visible Spectrum, Magnocellular Cell, Psych
11 Dec 2016
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Psych 2e03 lecture 28 colour vision (ch. 11 p. 356-358, 371- 388) Evolved as nocturnal animals became more active during daytime. Objects do not have colour, they reflect light in a way that produces the perceptual experience of colour. Colour is not a property of objects. Light of different wavelengths refracts differently when passing through a prism. Theories of colour vision: trichromacy, colour-opponency, dual process. Young & hemoltz (early 1900s: 3 colour primaries could be used to create all perceivable colours, therefore, 3 primary detectors would be logical. 3 types of cones in our retina. Each tuned to capture light in a wavelength dependent manner. Cones signal more when more light is absorbed, regardless of wavelength. Cones vary in their efficiency in transducing different wavelengths. Can get the same response from a single cone to different wavelengths if you scale for their transduction efficiency by increasing stimulus intensity.
