From the Retina to the Cortex

From the Retina to - From the Retina to the Cortex Vision Continued From the Retina to the Visual Cortex

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From the Retina to the Cortex Vision, Continued
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http://www.psc.edu/science/Miikkulainen/Miikkul.html From the Retina to the Visual Cortex
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Cicarelli, 2007
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From the retina to the visual cortex : What is neural convergence? What are receptive fields? How does info from the eyes get to the cortex? How are cells in the visual cortex specialized? Today’s Questions
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Convergence Photoreceptors: 100 million rods & 6 million cones Ganglion cells: 1 million Hence, many photoreceptors must converge onto a single ganglion cell Convergence
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Convergence in cones vs. rods ~ 1 to 10 cones converge onto 1 ganglion cell ~ 120 rods converge onto 1 ganglion cell Convergence
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Convergence & sensitivity This cell can “detect” light in any of 10 possible locations Each of these cells can “detect” light in only 1 location Convergence
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Convergence & sensitivity Spatial summation → greater response & sensitivity + 1 + 1 + 1 + 1 + 1 +5 Convergence Neuron is more likely to fire…
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Convergence & acuity Pattern not detected: Bad acuity Pattern detected: Good acuity Convergence
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Convergence & lateral inhibition Single-cell recording studies light → excitation light → inhibition electrode Convergence
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Convergence & lateral inhibition Spatial summation = ?
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This note was uploaded on 11/12/2009 for the course PSY 3321 taught by Professor Ceballos during the Spring '09 term at Texas State.

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From the Retina to - From the Retina to the Cortex Vision Continued From the Retina to the Visual Cortex

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