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Published byRosemary Willis Modified over 9 years ago
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Cat Retinal Ganglion Cell Physiological Classes
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Rabbit’s Visual Streak
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Molecular Determination of Ganglion Cell Classes
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Concentric G Cell Morpho Summary
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Central Projections
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Frog Retinal Ganglion Cell Classes
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Amphibian RGCs directly mediate behavioral responses
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Reporting direction of movement
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On-Off DS GCs Have 4 Directional Subtypes
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3-D Reconstruction of DS GC
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No Overall Dendritic Asymmetry
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DS Independent of Contrast
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DS is Independent of Velocity
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DS Subunits
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DS GCs exhibit directional hyperauity
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Anatomical Models
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Starburst (Cholinergic) Amacrine Cells
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One Hypothesis suggests asymmetric cholinergic input to account for some DS
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Borg-Graham & Grzywacz Asymmetric Ach Model
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Spike Codes: Is rate all that matters?
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Response Variability
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Control of Synchrony
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The Aperture Problem: What is Missing in the Output of One Cell
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Correlated Firing Encodes Unified Motion in Visual Cortex
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What is the Computational Importance of Synchronous Firing to the Next Stage?
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Hypothesis: The Brain Operates at Multiple Levels of Coherence.
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What Mechanisms Produce Synchronous Firing in Visual Cortex?
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Synchrony from Ganglion cells?
One Possible Solution: Suppose Close-by Retinal Ganglion Cells Supply a Synchronous Signal for Separated Cells in Higher Centers? Synchrony from Ganglion cells?
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Ganglion cell Synchrony Questions
Do Retinal Ganglion Cells Fire Synchronously? Does Synchronous Firing Code Anything Interesting? What Retinal Mechanisms Mediate Synchrony? Ganglion cell Synchrony Questions
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Multielectrode Recording: Flash vs Bar
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Extended Bar
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DS Ganglion Cell Responses to Extended Bars vs Flash (& Spot)
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GABAergic Amacrine Cell Control of Synchrony
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Spikes in Starburst Amacrine Cells
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Patch-Clamp Recording
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Multiple Spike Heights
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Can Hyperpolarizing Somatic Current Eliminate Spikes Produced by Preferred-Direction Motion?
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Can Depolarizing Somatic Current Overcome Null-Direction Motion Inhibition?
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Is Inability to Generate Spikes by Current During Null Motion Due to Fatigue or Active Adaptation?
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Is Shunting at Soma the Problem?
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