Transcript No Slide Title

Psych 203
Foundations of Vision
Professor Brian Wandell
http://www.stanford.edu/class/psych203
Lectures
Tues and Thurs, 3:15-4:30
Building 260 Room 008
Seminar format
• Lots of readings
• Lots of discussion and questions
• We will do some writing, presenting, and
perhaps computing
Turning the Tables
(R.N. Shepard)
Fraser’s
Spiral
The Perception of Lightness
Color Appearance Depends On The
Spatial Pattern Across The Cone
Mosaic
(Shevell and Monnier)
Craik-O’Brien-Cornsweet Effect
Move Back
and Forth
The Rings
Appear to
Rotate
Human Vision
What is the quality of the
eye’s optics?
Describe the receptor
sampling mosaic?
How do neurons in retina
and visual cortex respond?
How do we measure human
pattern and temporal
sensitivity?
L,M Cones Stained, S-Cones Unstained
Human Retina By The Numbers
(Rodieck, 1998)
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5 x 5 cm, 0.4 mm thick
# cones: 5 x 106
# rods: 108
Cone width in fovea: 1 mu
Contacts per cone: 250
106 optic nerve fibers
Color Science
How do we measure signals
used to create color?
How do we quantify these
color signals?
Hunk of brain/Hubel/Ferrier
Visual Areas: Human
Visual area
V1
V2
V3
Development of visual cortex
Perceptual Evaluation
• Carefully controlled viewing environment
• Calibrated display
• Visual psychophysical judgments
Discrimination
Preference
What’s Next?
1. Sign up for the class on Axess
2. Go to the class web-page and browse,
3. Start doing the readings
4. Start asking yourself questions for class discussion