L24_Vision2 - Lecture 23 Vision II March 14, 2008 Lecture...

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1 1 BioNB222 Lecture 23 Vision II March 14, 2008 Carl Hopkins Pyramidal cells, visual cortex 2 BioNB222 Lecture 23 RETINA a) ON-CELLS, OFF-CELLS b) RFs (receptive fields): CENTER & SURROUND (Lateral Inhibition) CNS a) 4 TARGETS b) LGN Layered and ordered c) CORTEX: functional modules in columns d) RECEPTIVE FIELDS: SIMPLE & COMPLEX. e) FUNCTIONAL ORDER: OCCULAR DOMINANCE BLOBS, ORIENTATION f) HIGHER VISUAL CENTERS 3 BioNB222 BioNB222 5 BioNB222 6 BioNB222
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2 7 BioNB222 Why two pathways? 9 BioNB222 10 BioNB222 Stephen Kuffler: receptive fields of two retinal ganglion cells 11 BioNB222 On center ganglion cell in the retina 12 BioNB222 Off Center – On Surround
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3 13 BioNB222 A B B B B B 14 BioNB222 16 BioNB222 MACH Bands 17 BioNB222 18 BioNB222
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4 19 BioNB222 Stephen Kuffler: receptive fields of two retinal ganglion cells. 20 BioNB222 Map of ganglion cell receptive field looks like a “Mexican Hat” Excitation Inhibition 21 BioNB222 Why Lateral Inhibition? Low contrast 0 5 10 15 0 5 10 15 -5 0 5 10 15 20 25 5 x 5 ‘hat’ 13 x 13 hat 378x245 22 BioNB222 Victor Vasarely 1908-1997 23 BioNB222 24 BioNB222
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5 25 BioNB222 26 BioNB222 27 BioNB222 Path of Retinal Ganglion Cells RGC Lateral Geniculate Nucleus (THALAMUS) Visual Cortex 28 BioNB222 SUPERIOR COLLICULUS (vis) 29 BioNB222 PRETECTUM (non visual) 30 BioNB222 HYPOTHALAMUS (non visual)
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6 31 BioNB222 LATERAL GENICULATE NUCLEUS (vis) 32 BioNB222
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This note was uploaded on 04/30/2008 for the course BIO 2220 taught by Professor Hopkins,c.d. during the Spring '08 term at Cornell University (Engineering School).

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L24_Vision2 - Lecture 23 Vision II March 14, 2008 Lecture...

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