psych 203 foundations of vision

LecturesTues and Thurs, 3:15-4:30Building 260 Room 008

Psych 203Foundations of Vision

http://www.stanford.edu/class/psych203

Professor Brian Wandell

• Lots of readings

• Lots of discussion and questions

• We will do some writing, presenting, and

perhaps computing

Seminar format

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

ForthThe 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)

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

V1V2V3

Visual area

Visual Areas: Human

Development of visual cortex

Perceptual Evaluation

• Carefully controlled viewing environment• Calibrated display• Visual psychophysical judgments

DiscriminationPreference

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