317 - 6
Popular in Sensation and Perception
Tricia Mae Fortuna
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Popular in Psychology (PSYC)
This 1 page Class Notes was uploaded by Tricia Mae Fortuna on Thursday October 6, 2016. The Class Notes belongs to 317 at Towson University taught by M. Paz Galupo in Fall 2016. Since its upload, it has received 8 views. For similar materials see Sensation and Perception in Psychology (PSYC) at Towson University.
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Date Created: 10/06/16
10/04/2016 EXAM 2: Anatomy of Retina, LGN, & Visual Cortex Retina Network: Cells within the same structure forming synapses on one another Retinal Circuitry (rules) Vertical (excitatory – convergence) o Receptors make EXCITATORY synapses on Horizontal Cells o Receptors make EXCITATORY synapses on Bipolar Cells o Bipolar Cells make EXCITATORY synapses on Amacrine Cells o Bipolar Cells make EXCITATORY synapses on Ganglion Cells Horizontal (inhibitory – lateral inhibition) o Horizontal Cells making INHIBITORY synapses on Bipolar Cells o Amacrine Cells making INHIBITORY synapses on Ganglion Cells Characteristics of Retinal Circuitry (and Networks in General) Convergence: When you have many cells synapsing on to fewer number of cells o 3 receptors converging to 1 Ganglion Cells Lateral Inhibition: Inhibitory Synapses that are projecting horizontally (same level) o #6 and #7 cells Receptive Field of a Neuron includes all of those receptors that when activated affect the firing rate of that cell. Receptive field of neuron #1 is neuron #1 – when light hits neuron #1 it becomes EXCITATORY (for 2 and 3 also) Receptive field of #4 is neuron #1 – EXCITATORY (1+) For #6 is #3 EXCITATORY (3+) For #5 is #2 EXCITATORY and #3 - #6 INHIBITORY – (2+ & 3-) For #7 is #1 EXCITATORY (1+) For #8 is #1 INHIBITORY, #2 EXCITATORY, and #3 is INHIBITORY (1-, 2+, & 3-) Receptive Field of Ganglion Cells Center Surround Antagonistic (CSA) – ganglion cells have a receptive field called a CSA field includes a center and a surround that affect the firing rate in opposite ways Size and configuration tells you the convergence We need convergence Optimal Stimulus for a CSA cell is for light to fall differentially on the center and not the surround. o For #8: to EXCITE light should hit #2; to INHIBIT light should hit #1 & #3 Sensitive to Contrast of Information (system is biased to the contrast of information)
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