KP161 Lecture Notes - Lecture 9: Optical Flow, Stretch Reflex, Visual Acuity
30 Jan 2017
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Document Summary
Rods: located in peripheral retina, respond to low lighting conditions. Cones: located mostly in fovea, stimulated at high levels of illumination and color. Blind spot is at optic nerve due to lack of photoreceptors. Photoreceptor -> optic nerve -> optic chiasm -> optic tract -> lgn -> optic radiation -> v1. V1 = primary visual cortex = b. a. Functions to identify objects located primarily in the center of the visual field. Thought to be responsible for spatial localization and orientation. Ambient- tectopulvinar (whole body movements like locomotion & posture) Parvo (stimulus identification, colour selective, slow, high spatial resolution & low contrast sensitivity) Magno (global visual processing, colour unselective, fast, low spatial resolution & high contrast sensitivity) Degree of detail that can be seen. Snellen eye chart used to determine visual acuity. Reflects cns" ability to estimate object"s properties. Oculomotor systems tracks and keeps image on fovea. 6 muscles that move the eye in 6 directions.
