PSYA01H3 Chapter Notes - Chapter 4: Thalamus, Fusiform Face Area, Face Perception
Document Summary
Rods - photoreceptors that occupy peripheral regions of the retina; they are highly sensitive under low light levels. Cones - photoreceptors that are sensitive to the different wavelengths of light that we perceive as color: clustered around fovea. Fovea- central region of retina: cones are clustered in fovea (i. e. , are the center of our visual eld, rods are limited to the periphery of the retina. We do not see color at night or in darkness because rods are more active than cones under low light levels. Trichromatic theory (or young-helmholtz theory) maintains that three different cone types are sensitive to short, medium, and long wavelengths of light determine color vision: respond to wavelengths associated with the colors blue, green, red. Nearsightedness, or myopia - eyeball is slightly elongated, causing image that the cornea and lens focus on to fall short of the retina. People who are nearsighted can see objects that are relatively close up but have dif culty.
