PSYC 212 Lecture Notes - Lecture 9: Fender Wide Range, Hollerado, Visual Cortex

• School: McGill University
• Department: Psychology
• Course: PSYC 212
• Professor: Mathieu Roy

Document Summary

Color blindness = ~8% of male population & 0. 5% of female population some form of color vision. Because most still see some color not truly color blind. Has only 1 cone type so truly color-blind because of. Most color-blind individuals = can still make discriminations based on wavelength. *but those discriminations just different from norm. *rods = only 1 type sensitive to scotopic light levels. All rods = have same sensitivity to various. So cannot see color under scotopic dim light. Because only have 1 photoreceptor & need all 3. Theory that color of any light = defined in visual system by relationships of. 3 numbers outputs of 3 receptor types now known to be 3cones. Physics experiments = thomas young [1773 1829] & hermann von helmholtz [1821 189] Independently discovered trichromatic nature of color perception using color-matching technique. Color of 1 light = recreated by mixing color of 3.