PSYC 212 Lecture Notes - Lecture 6: Ganglion Cell, Retina Horizontal Cell, Lateral Inhibition
10 Feb 2018
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In the original example, light on the photoreceptor hyperpolarize it so there is a negative sign. On the surround, it is the opposite, darkness will give a positive sign to the photoreceptors. Then the horizontal cells, when they receive positive signs from these photoreceptors, they will convert the positive signs to a negative sign and project it back to all the photoreceptors. Then the on center ganglion cell will convey information but the information is not enough to get a firing and thus the information stops there. Darkness enhance the responding of the ganglion cell (to clarify) If we have a few cycles for a specific area, thus on the left we have a lower frequency than on the right. The more pattern per area, the higher the frequency. In addition to frequency, the other to determine the frequency is the contrast. The pattern on the left has a higher contrast than the right one.
