PSYC 100 Lecture Notes - Lecture 9: Color Vision, Purkinje Effect, Peripheral Vision

• School: Queen's University
• Department: Psychology
• Course: PSYC 100
• Professor: Jordan Poppenk

Document Summary

Light: the adequate stimulus for vision is light. This is a form of electromagnetic energy, made of particles, called photons. The colors we see depend on the wave length or the frequency of the light. Brightness is the intensity of the light; the two characteristics are amplitude and intensity. Lens and cornea work together to focus light, creates upside down image, then light energy is transferred into neural impulses: retina: inner surface of the back of the eye, light sensitive receptor cells are located here. Light to nerve signal: both rod and cone contains 4 photo pigments, when exposed to light, these become whiter (bleached), which cause the receptors less receptive to light, whiter is more reflective so less light is absorbed. In light, rod (1 photo pigment) is bleached a lot, in contrast cone has 3 so it need more light to be bleached.