PS267 Chapter Notes - Chapter 5-6: Visual Cortex, Optic Chiasm, Visual Acuity
Document Summary
Rods and cones contains photopigments (when incoming light waves turn into a neural signal the brain can understand) Good for low light; takes long to replenish in bright light. Do(cid:374)"t (cid:374)eed (cid:373)u(cid:272)h light for ga(cid:374)glio(cid:374) to sig(cid:374)al, (cid:271)ut ga(cid:374)glio(cid:374) does(cid:374)"t k(cid:374)o(cid:449) where it came from. Good in bright light; three types of cones. Spot in eye with no cones and rods; where optic nerve leaves the eye. Do(cid:374)"t per(cid:272)ei(cid:448)e a (cid:271)li(cid:374)d spot (cid:271)e(cid:272)ause other eye (cid:272)o(cid:373)pensates and we fill in the gaps. Axons of ganglion cells form the optic nerve: carries information from the retina to the brain. If the ganglion cell with input from cone has enough light to fire: then the ganglion cell knows exactly where in the eye the signal came from. Retina - optic chiasm - 90% of axons - lgn - primary visual cortex (v1) Info from back of eye splits into 2 pathways.
