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PSYC 2220 Lecture Notes - Trichromacy, Scotopic Vision, Color Term

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School
York University
Department
Psychology
Course
PSYC 2220
Professor
Jennifer Steeves

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Document Summary

A single photoreceptor shows different responses of lights of different wavelengths but the same intensity: rods are sensitive to scotopic light levels. More generally, any part of stimuli that are perceived as identical in spite of physical differences: colours that are indistinguishable to the normal visual system. Colour space: colour space: a three-dimensional space that describes all colour. Some lgn cells are excited by l-cone onset in center inhibited by. M-cone onsets in their surround (and vice-versa: red versus green. Other cells are excited by s-cone onset in center, inhibited by (l + M)-cone onsets in their surround (and vice-versa: blue versus yellow, some colour combinations are legal while others are illegal. We can have bluish green reddish yellow (orange), or blueish red. We cannot have reddish green or blueish yellow: we can use the hue cancellation paradigm to determine the wavelengths of (purple) unique hues.

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Related Questions

Critics of the trichromatic theory of colour vision have indicated that this theory has a major limitation. Which of the following statements MOST accurately reflects this limitation? A) Young and von Helmholtz were incorrect in assuming that cone photoreceptors in our retina are maximally responsive to a specific wavelength of light B) The trichromatic theory cannot explain the phenomenon of visual after-effects C) Rod photoreceptors in our retina, not cones, are responsible for the neural coding of colour D) Research has determined that there are actually six types of cones in the retina, rather than three as proposed by Young and Helmholtz E) Trichromatic theory cannot explain sensory adaptation

33. The theory of color vision that proposes that the human eye has three types of receptors sensitive to different wavelengths is: a. the tridetector theory. c. the trichromatic theory b. the opponent process theory. d. the tripartite theory.

1. Zachary was born with a rare visual defect. He has no cone photoreceptors in his retina, there are only rods. Assuming that all other aspects of his visual system are normal, which of the following would characterize Zachary's vision? A) poor visual acuity B) an inability to differentiate between black and white C) a difficulty seeing in low light conditions D) colour blindness E) both A) and D)