CHAPTER 9: Colour Perception Flashcards
the trichromatic theory of colour vision proposes that colour perception is based on the responses of _______?
three types of cone cells
which are of the brain is used in processing colour information and is damaged in cases of achromatopsia?
the centro-medial occipital lobe
anomalous trichromats differ from normal trichromats in terms of their _____?
neural processing of colour information
what does the principle of univariance state?
absorption of a photon causes the same effect, regardless of its wavelength
what are chromatic colours vs spectral colours vs nonspectral colours? provide examples for all
chromatic colours are colours with a hue. ex. blue, red, green, yellow
spectral colours are colours that appear in the visible spectrum. ex. red, blue, yellow
non-spectral colours are colours that do not appear in the visible spectrum because they are made by mixing colours from the spectrum. ex. magenta is a mixture of blue and red
illumination edge vs reflectance edge
illumination edge: the boarder between two areas created by different light intensities in the two areas
reflectance edge: an edge between two areas where the reflectance of two surfaces change
explain dichromatism and different forms of it
dichromatism is a form of colour deficiency in which a person has just two types of cone pigment and can see chromatic colours, but confuses some colours that trichromats can distinguish
Protanopia: a form of dichromatism in which a they are missing the long-wavelength pigment, and percieves short-wavelength light as blue and long wavelength as yellow
deuteranopia: a form of dichromatism is which a person is missing the medium-wavelength pigment. they percieve turquoise at short wavelengths and yellow at long wavelengths
Tritanopia: a form of dichromatism in which they are missling the short wavelength. They see blue at short wavelength, red at long wavelengths
