Psychology 1000 Lecture Notes - Lecture 15: Contrast Effect, Retina, Retina Horizontal Cell

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Bipolar: amacrine inhibitory neurons, horizontal. Operate at higher light intensities (insensitive for brightness) Operate at low intensity (sensitive for brightness) Visual pigments breaks down light waves into nerve impulses: rods, rhodopsin breakdown causes red to become orange then clear/bleached, cones (3 clolours) breaks down presence of colour, chlorolabe (green, erythrolabe (red, cyanolabe (blue) How to demonstrate this: dark adaptation, after bleaching the retina, the screen will flash something and the time you see it is measured. Simultaneous contrast (grey rectangle and white background, change background to black and the colour grey appears to be changing intensity) Single cell recording: isolate single retinal ganglion cell, attach microelectrode and record output of the ganglion cell, project a spot of light on screen and move until output maximum. This is the retinal area served by that ganglion cell. Movement in any direction decreases firing rate: receptive field. Without the spot there is the baseline firing rate.