Psychology 1000 Lecture Notes - Lecture 14: Strobe Light, Receptive Field, Rhodopsin

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

Document Summary

Ganglion cells first stage on outer range of retina: retina. This is where info is decoded and sent to the optic nerve. Horizontal cells also used, inhibitory from receptor to ganglion. Clean up image on the way to ganglion. 2 kinds of ways to decode a visual signal, with rods and cones: 120 million rods, 7 million cones, rods. Pick up low sources of light: cones. Insensitive for brightness: at low levels of light, they won"t work. Break down into chemicals, generates action potential and neural signal is sent to brain. Rods: rhodopsin the pigment in rods. At first, you see nothing, but then start to see fine. Colored light shine on fovea: shows which cones are sensitive to which lights. Project spot of light on screen and move until output maximum. This is retinal area served by that ganglion cell. Movement in any direction decreases firing rate. Every ganglion cell has a receptive field.