PSYB51H3 Chapter Notes - Chapter 5&7: Opponent Process, Retinal Ganglion Cell, Spectral Power Distribution
Document Summary
Chapter 5 & 7 definitions: problem of univariance: the fact that an infinite set of different wavelength-intensity combinations can elicit exactly the same response from a single type of photoreceptor. One photoreceptor type cannot make color discriminations based on wavelength: scotopic: light intensities that are bright enough to stimulate the rod receptors but too dim to stimulate the cone receptors. Compare scotopic and mesopic: photopic: light intensities that are bright enough to stimulate the cone receptors and bright enough to saturate the rod receptors (i. e. , drive them to their maximum responses). Helmholtz theory: metamers: different mixtures of wavelengths that look identical. More generally, any pair of stimuli that are perceived as identical in spite of physical differences: additive color mixture: a mixture of lights. If light a and light b are both reflected from a surface to the eye, in the perception of color the effects of those two lights add together: subtractive color mixture: a mixture of pigments.
