PSY 368 Lecture Notes - Lecture 16: Spectral Sensitivity, Psy, Color Vision
24 Oct 2017
School
Department
Course
Professor
Document Summary
Lots of blended light hitting a surface. Because of property of that surface, absorbing wavelengths. Ones that are absorbed are subtracted out don"t reach your eye. Proposed by young (1802) and helmholtz (1852) Color vision results from activity of 3 cone photorecp w/ diff spectral sensitivities: short-wavelength receptors, medium-wavelength receptors, long-wavelength receptors. Each receptor type is tuned to a particular wavelength. The tuning functions for receptors are very broad tho. Principle of univariance: although each cone type may be tuned to particular wavelength, receptor response does not signal a particular wavelength. No, firing rate of a cone dep both on wavelength of the light and its intensity: receptor resp is uni-dimensional (firing rate), it herefore cannot code two indep dimensions (wavelength and intensity) Change in firing rate might mean change in intensity, wavelength, or both; recep resp is ambiguous. Need at least 2 types of recep w/ diff spectral sensitivities to discriminate colors.
