PSY 252 Lecture Notes - Lecture 7: Visual Cortex, Off Centre, Retina
Document Summary
Your perception of colour shifts under different lighting conditions. Shine light on specific photoreceptors that have lateral connections made by the horizontal cells. This patch of photoreceptors send signals down to ganglion cells. You can have many of these photoreceptors converging to a single ganglion cell (called neural convergence) We can stick an electrode in that ganglion cell with an electrode and see how it responds to those photoreceptors. Every ganglion cell has a little window to your visual world and it depends on the photoreceptors it gets info from. Each ganglion can only get info from certain photoreceptors called the receptive field for that ganglion cell. Can measure the spike rate to see what colour it is looking at like a dark (less firing) patch or a light (fires lots) patch or an in between for grey. Ganglion cell does neural summation (adds the info from the photoreceptors)
