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Lecture 33

LING 1200 Lecture 33: Lecture 33

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LING 1200
Erin L.Wilkinson

− Rods and cones report information about light energy reflected off objects to bipolar neurons which report to ganglion cells which exit the eye at the optic disc and form the optic nerve − Ganglion cells: axons bundle up forming the optic nerve to the brain − Myelin coating on axons are essential for vision − Heavily coated makes it quick (visual perception system needs to be fast − No rods or cones at the optic disc, so people are blind for information at that spot (blind spot) − Optic disc (blind spot): right in the middle of the field of vision How Can We Not Know We Have a Blind Spot?: 1. One eye is blind for some spot out there, but the other eye is not blind for that same spot (both eyes have different blind spots, and it compensates for each other) 2. Eyes move around all the time so we don’t notice (not perfectly stationary and what we miss with the blind spot the retina receives) 3. The brain is good at filling in information that is missing Visual Information as Neural Messages: − Photoreceptors respond to amounts of light at a certain part of the visual field − Amount of light determines rate of firing in ganglion cells (these cells send this information on to the brain)
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