PSYB51H3 Lecture Notes - Lecture 5: Monochromacy, Trichromacy, Motion Aftereffect
Document Summary
If you send white light through an aperture of a glass prism the light will fan out because of refraction: why does this happen, different wave lengths bend differently. Image is made up of three different wave lengths (blue, green and red) Univariance: a single cone cannot give us the information on any colours out in the real world. An infinite set of different wavelength intensity combinations can elicit the same response from a single type of photoreceptor. Gree(cid:374) rods do(cid:374)"t see gree(cid:374) i(cid:374) di(cid:373) light. But the output is always different: each photoreceptor responds differently to wave lengths, we can adjust the energy of the different wavelengths of the shined onto a photoreceptor and arrive at the same output. Young-helmholtz and maxwell theory: colour vision is based on 3 photoreceptors sensitive to ranges of wavelengths. S cones= short wavelengths at 420nm (blue cones) M cones= medium wavelengths at 534nm (green cones)
