1. Unit 4: Sensation and Perception
CHS AP Psychology
Unit 4: Sensation and Perception
Essential Task 4-2:Describe the sensory process of vision including the specific nature of energy transduction (rods and cones and the trichromatic theory of color vision), relevant anatomical structures (cornea, pupil, iris, lens, retina, optic nerve, blind spot and fovea) and specialized pathways in the brain (opponent process theory of color vision and the occipital lobe).
Logo Green is R=8 G=138 B= Blue is R= 0 G=110 B=184
Border Grey is R=74 G=69 B=64

2. Path light travels through the eye.

3. Where there are no optic nerve cells
Find your blind spot
Get a textbook
Turn to page 239
Complete exercise 6.9
Where there are no optic nerve cells

4. Fovea
The green and red cones are concentrated in the fovea centralis. The ‘blue’ cones  are mostly found outside the fovea centralis.
Central fovea (Fovea Centralis) is responsible for visual acuity and color sensitivty.

5. Transduction occurs in the Retina

6. Rods and Cones

7. Trichromatic Color Theory
We see color due to the
RED
GREEN
BLUE
Cones in the retina

8. Color Blindness Dichromatic problems with reds and greens
Dichromatic problems with blues and greens

9. Color Blindness Tests

10. Opponent Process Theory
Further up in the optic nerve, neurons work in pairs to help process color vision signals.
Red-Green = Xmas
Blue-Yellow = Beach Ball
Black-White = Oreo

11. Opponent Process theory helps us explain the after-image effect
Your textbook has an example on page 244, but with the Union Jack, which is the British flag. Try it!