01:830:301 Lecture Notes - Lecture 7: Color Blindness, Ganglion Cell, Receptive Field
Document Summary
Inverted y axis- going down means better sensitivity. Y axis : sensitivity (1/sensitivity= absolute threshold) )-there are two different mechanism (rods and cones) Cone system is more sensitive than rod system in the first 5 minutes of time in dark. Ganglion cells (make up optic nerve) - 1. 25 million. Single cell recording- measure from one single neuron. Most of the retina- no response (not fire at all: one ganglion cell don"t respond, continues to fire at baseline firing rate, this means that for most of retina, this cell doesn"t care. Small circular region where light excites the cell (increase firing rate: on response, an on bipolar cell is a cone bipolar cell that depolarizes in response to an increase in light intensity. Donut shape region where light inhibits the cell (decrease firing rate: off response, an off bipolar cell is a cone bipolar cell that depolarizes in response to a decrease in light intensity.
