How We See Terrence Sejnowski HHMI Salk Institute University of - PowerPoint PPT Presentation

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How We See Terrence Sejnowski HHMI Salk Institute University of California, San Diego Levels of Investigation Simple Cells in Visual Cortex Hubel and Wiesel (1962) DeAngelis, Ohzawa and Freeman (1995) Goal of Vision "Regarding the

How We See Terrence Sejnowski HHMI Salk Institute University of California, San Diego
Levels of Investigation
Simple Cells in Visual Cortex Hubel and Wiesel (1962) DeAngelis, Ohzawa and Freeman (1995)
Goal of Vision "Regarding the central goal of vision as scene recovery makes sense. If we are able to create, using vision, an accurate representation of the three-dimensional world and its properties, then using this information we can perform any visual task" Aloimonos and Rosenfeld (1991)
Complexity of the Visual World
The Unexpected Visitor 1. Free viewing, 2. Estimate the material circumstances of the family, 3. Give the ages of the people
Attention Modulates Firing Rate “Not attended” 80 0 0 500 1000 1500 2000 2500 3000 350 70 60 Firing Rate (Hz) “Attended” 50 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 350 Time (ms) Desimone, 2001
Decisions, Decisions
Reward Modulates Visual Responses Glimcher, 2002
DOPAMINE
Dopamine Pathways
Wolfram Schultz (and friend)
Temporal Differences Revealed Schultz, Dayan, Montague, 1997
Tesauro, 1994 TD Gammon
Tesauro, 1994 TD Gammon
Hammer and Menzel, 1997 VUMmx1 - Octopamine
Peter Dayan Read Montague Gerald Tesauro Kenji Doya

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