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Perception 
A personal way of knowing
What is perception? 
Perception - The awareness of things through our 
five senses 
● sight 
● sound 
● touch 
● taste 
● smell
Primary Knowledge 
Most primary knowledge which we pick up 
as we experience more things can be gained 
through perception. We have the ability to 
learn from our mistakes which can easily link 
to the perception of different situations.
Perceptual illusions 
http://artofrylee.files.wordpress.com/2012/01/schusters_clevis.jpg
Perception consists of two elements: 
Sensation — provided 
by the world 
Interpretation — 
provided by our minds 
Visual illusions involve 
interpretation
Context 
We tend to judge things in different ways by looking at the overall context. 
http://upload.wikimedia.org/wikipedia/commons 
/6/60/Grey_square_optical_illusion.PNG 
http://people.kzoo.edu/ggre 
gg/images/bor13-r.jpg 
http://thebrain.mcgill.ca/flash/a/a_02/a_0 
2_p/a_02_p_vis/a_02_p_vis_1n.jpg 
A and B are exactly the same color!
Figure and ground 
When we look at something, we highlight certain aspects of the scene 
(figure) and place other parts of it in the back(ground). 
http://mesosyn.com/mental8-8q.jpg 
http://media-cache-ec0. 
pinimg.com/736x/a8/00/8d/a8008da4c6d29e 
56cee8eaf395f5ea2d.jpg
Visual grouping 
We seek meaning in what we see by grouping things into shapes and 
patterns. 
http://www.moillusions.com/wp-content/ 
uploads/2009/12/Mysterious-Dalmatian- 
Optical-Illusion.jpg 
http://www.biomotionlab.ca/Demos 
/BMLwalker.html
Expectations 
Expectation influences experience. 
http://cloudfront7.ia.net/wp-content/uploads/2013/03/paris-in-the-spring3@2x.png
Unconscious 
Many of our perceptions of the 
world happen at an unconscious 
level. 
Constantly making unconscious 
inferences about our experiences.
Examples of Unconscious 
- Sight- seeing the world upside 
down 
- Image in the bathroom mirror 
- person walking towards you 
- the world as blobs of color
Selectivity 
Count the number of times 
the white team passes the 
ball in this video. 
Everyone who counts 
correctly will be granted 
a surprise!
Selectivity of perception 
● Our minds would overload on information if our perception 
was not selective. 
● Personal interests/moods act as filters. 
● Contrast and intensity are important factors. Example: 
-Bomb vs. Ticking clock 
● We have evolved to be sensitive to moving objects. 
● emotions can alter your perception of things. Examples: 
-Love 
-Fear
Seeing and Believing 
—Believing is seeing
Beliefs affect our perception 
● Science 
● History 
● Art
Eye-Witness Testimony 
● Unreliable 
● Memory 
● Reconstructed
Appearance vs Reality 
Though our perception is a great source of 
knowledge, we can at times misinterpret and 
fail to notice things we see and remember.
Confirmation by Another Sense 
A way to distinguish 
appearance from reality 
is to use another sense 
to confirm what 
something is.
Coherence 
Another way to discern 
appearance from reality is 
through coherence. If 
something you see doesn't fit 
within your overall 
experience of the world, then 
you’re probably mistaken
Independent Testimony 
The final way to determine 
appearance from reality is to 
get the testimony of another 
person.
Ultimate Reality 
What is there when we strip away the 
interpretation that our sense-organs impose 
on us?
Our experiences are subjective 
Colors, sounds and tastes do not exist out 
there independent of our experience of these 
sensations.
Physical vs Experienced 
Sensation 
● Experienced 
sound - the 
actual crash that 
we hear 
● Physical Sound 
- vibrations in 
the air
Theories of Reality 
Common-sense Realism: The way we perceive 
the world mirrors the way the world is.
Problems with Common Sense 
Realism Variability of Perception - More plausible 
that the object doesn’t change, but our 
perception does.
Scientific Realism There is an ultimate 
reality, but it isn’t what 
we experience.
Phenomenalism Beyond our experience of 
reality, there is nothing to be 
said.

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Theory of knowledge perception

  • 1. Perception A personal way of knowing
  • 2. What is perception? Perception - The awareness of things through our five senses ● sight ● sound ● touch ● taste ● smell
  • 3. Primary Knowledge Most primary knowledge which we pick up as we experience more things can be gained through perception. We have the ability to learn from our mistakes which can easily link to the perception of different situations.
  • 5. Perception consists of two elements: Sensation — provided by the world Interpretation — provided by our minds Visual illusions involve interpretation
  • 6. Context We tend to judge things in different ways by looking at the overall context. http://upload.wikimedia.org/wikipedia/commons /6/60/Grey_square_optical_illusion.PNG http://people.kzoo.edu/ggre gg/images/bor13-r.jpg http://thebrain.mcgill.ca/flash/a/a_02/a_0 2_p/a_02_p_vis/a_02_p_vis_1n.jpg A and B are exactly the same color!
  • 7. Figure and ground When we look at something, we highlight certain aspects of the scene (figure) and place other parts of it in the back(ground). http://mesosyn.com/mental8-8q.jpg http://media-cache-ec0. pinimg.com/736x/a8/00/8d/a8008da4c6d29e 56cee8eaf395f5ea2d.jpg
  • 8. Visual grouping We seek meaning in what we see by grouping things into shapes and patterns. http://www.moillusions.com/wp-content/ uploads/2009/12/Mysterious-Dalmatian- Optical-Illusion.jpg http://www.biomotionlab.ca/Demos /BMLwalker.html
  • 9. Expectations Expectation influences experience. http://cloudfront7.ia.net/wp-content/uploads/2013/03/paris-in-the-spring3@2x.png
  • 10. Unconscious Many of our perceptions of the world happen at an unconscious level. Constantly making unconscious inferences about our experiences.
  • 11. Examples of Unconscious - Sight- seeing the world upside down - Image in the bathroom mirror - person walking towards you - the world as blobs of color
  • 12. Selectivity Count the number of times the white team passes the ball in this video. Everyone who counts correctly will be granted a surprise!
  • 13. Selectivity of perception ● Our minds would overload on information if our perception was not selective. ● Personal interests/moods act as filters. ● Contrast and intensity are important factors. Example: -Bomb vs. Ticking clock ● We have evolved to be sensitive to moving objects. ● emotions can alter your perception of things. Examples: -Love -Fear
  • 14. Seeing and Believing —Believing is seeing
  • 15. Beliefs affect our perception ● Science ● History ● Art
  • 16. Eye-Witness Testimony ● Unreliable ● Memory ● Reconstructed
  • 17. Appearance vs Reality Though our perception is a great source of knowledge, we can at times misinterpret and fail to notice things we see and remember.
  • 18. Confirmation by Another Sense A way to distinguish appearance from reality is to use another sense to confirm what something is.
  • 19. Coherence Another way to discern appearance from reality is through coherence. If something you see doesn't fit within your overall experience of the world, then you’re probably mistaken
  • 20. Independent Testimony The final way to determine appearance from reality is to get the testimony of another person.
  • 21. Ultimate Reality What is there when we strip away the interpretation that our sense-organs impose on us?
  • 22. Our experiences are subjective Colors, sounds and tastes do not exist out there independent of our experience of these sensations.
  • 23. Physical vs Experienced Sensation ● Experienced sound - the actual crash that we hear ● Physical Sound - vibrations in the air
  • 24. Theories of Reality Common-sense Realism: The way we perceive the world mirrors the way the world is.
  • 25. Problems with Common Sense Realism Variability of Perception - More plausible that the object doesn’t change, but our perception does.
  • 26. Scientific Realism There is an ultimate reality, but it isn’t what we experience.
  • 27. Phenomenalism Beyond our experience of reality, there is nothing to be said.

Editor's Notes

  1. Visual illusions are relevant to our study of perception because they support the notion that our brain tries to make informed decisions about reality. As with the case of illusions, these inferences are not always accurate.