1. Unit 5: Senation & Perception Day 3: Visual Processing
DAILY COMMENTARY (in a spiral notebook!):
Explain opponent process theory based on your reading.
Essential Question
How do we use our senses to perceive the world around us?
Objectives (write this down!):
I can: explain the opponent process theory
I can describe the feature detection process

2. Unit 5: Senation & Perception Day 3: Visual Processing
On your DESK:
RJ 4.4
For Tonight:
Spend time on the Tatum essay for Minority Studies
I will allow time (20 minutes) to work on 4.5 in class tomorrow
Today: DC
PsychInquiry Module
Opponent Process Theory
Then take the corresponding quiz
Notes
Progress Reports & contracts

3. 2 things
Lap top cart
card

4. Visual Information Processing
Optic nerves connect to the thalamus in the middle of the brain, and the thalamus connects to the visual cortex.
OBJECTIVE 7| Discuss the different levels of processing that occur as information travels from the retina to the brain’s cortex.

5. Feature Detection
Nerve cells in the visual cortex respond to specific features, such as edges, angles, and movement.
Ross Kinnaird/ Allsport/ Getty Images

6. Shape Detection
Specific combinations of temporal lobe activity occur as people look at shoes, faces, chairs and houses.
Ishai, Ungerleider, Martin and Haxby/ NIMH

7. Perception in Brain
Our perceptions are a combination of sensory (bottom-up) and cognitive (top-down) processes.

8. Visual Information Processing
Processing of several aspects of the stimulus simultaneously is called parallel processing. The brain divides a visual scene into subdivisions such as color, depth, form and movement etc.
OBJECTIVE 8| Discuss parallel processing and discuss its role in visual processing.

9. From Sensation to Recognition
Tim Bieber/ The Image Bank

10. Theories of Color Vision
Trichromatic theory: Based on behavioral experiments, Helmholtz suggested that the retina should contain three receptors that are sensitive to red, blue and green colors.
Standard stimulus
OBJECTIVE 9| Explain how the Young-Helmholtz and opponent-process theories help us understand color vision.
Comparison stimulus
Max
Medium
Low
Blue
Green
Red

11. Subtraction of Colors
If three primary colors (pigments) are mixed, subtraction of all wavelengths occurs and the color black is the result.

12. Addition of Colors
If three primary colors (lights) are mixed, the wavelengths are added and the color white is the result.
Fritz Goro, LIFE magazine, © 1971 Time Warner, Inc.

13. Color Blindness
Genetic disorder in which people are blind to green or red colors. This supports the Trichromatic theory.
Ishihara Test

14. Opponent Colors Gaze at the middle of the flag for about 30
Seconds. When it disappears, stare at the dot and report
whether or not you see Britain's flag.

15. Opponent Process Theory
Hering proposed that we process four primary colors combined in pairs of red-green, blue-yellow, and black-white.
Cones
Retinal
Ganglion
Cells

16. Color Constancy
Color of an object remains the same under different illuminations. However, when context changes the color of an object may look different.
OBJECTIVE 10| Explain the importance of color constancy.
R. Beau Lotto at University College, London

17. PsychSim5 Module Google: PsychSim5
Select: COLOR VISION
Then take the corresponding quiz
RECOMMENDATION: BE SURE YOUR READING JOURNAL FOR THIS SECTION IS THOROUGHLY COMPLETE

18. Work Time Plan your Sensation books What story can you adapt?
What information about the eye will you want to include?