1. The Nature of Perception
Do we see the world the way it “really” is?
Eidolon Theory (Democratus)
Ray Gun Theory (Euclid)
Naïve Realism
Why the Theory of Naïve Realism is Flawed

2. Eidolon Theory: Democratus

3. Ray-Gun Theory: Euclid

4. The Theory of Naïve Realism
We see the world the way we see it - because that’s the way it “really” is

5. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
Different species see the world differently

6. Electromagnetic Spectrum
Light at different wavelengths is experienced as different colours

7. Albert Einstein
as seen by a bee

8. A Bee
as seen by a bee

9. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
Different species see the world differently
Different humans see the world differently
-Vision deficiencies

10. How the world looks to a person with a blue/yellow color deficit (tritanopia).
How the world looks to a person with a red/green color deficit (deuteranopia).
The world.

11. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
Different species see the world differently
Different humans see the world differently
-Vision deficiencies
-Brain Damage

12. .
Prosopagnosia

13. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
2. The same person can see the world differently

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18. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
2. The same person can see the world differently
3. Experience affects perception

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21. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
2. The same person can see the world differently
3. Experience affects perception
Trichromatic Theory of Vision - Helmholtz

22. Green
Red
Blue
% Of
Response .
Wavelength

23. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
2. The same person can see the world differently
3. Experience affects perception
Trichromatic Theory of Vision - Helmholtz
Opponent Process Theory of Vision - Herring

24. Opponent Process Theory of Vision.
Opponent Process Theory of Vision

25. .

26. Why the Theory of Naïve Realism is Flawed
1. Different individuals see the world differently
2. The same person can see the world differently
3. Experience affects perception
4. Sometimes we see the world in a way it cannot be.

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30. Perception depends on the interaction between stimuli from the world and our sensory systems