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Ted Talk: Optical Illusions – I think, I see, I wonder…
Perception Continued!
Get Out Your Notebooks!
Sense Perception‘Two thirds of what we see is behind our eyes.’
- Chinese Proverb
Sensation - material gathered from world
Interpretation - provided by our minds
Selectivity The role of the unconscious Expectations
Perception is Complex
You cannot process all of the sense data you are surrounded by
Your mind SELECTS which details to attend to. Ex. Traffic outside, computer hum, a roach in the
floor How does the mind ‘decide’ what to be
conscious of? Intensity and contrast are two seemingly
objective factors that may have evolutionary origin
Selectivity
Mood and Interest may affect selectivity Ex. Three friends walking trails at Radnor Lake,
an argument over music If your family buys a new car, you will
immediately start to notice every car in traffic that is similar
If a woman becomes pregnant, she will notice every pregnant woman
Subject Selectivity
Take one of the following phenomena and describe how it might be seen through the eyes of the following people:
a. a child dying in poverty as seen by a doctor, an economist, a social worker, the child’s father.
b. a sunset as seen by a religious figure, a physicist, a painter, a farmer
c. a tree as seen by a biologist, a logger, an environmentalist, a native American.
Time-Out!
How much of ‘seeing’ is done with our eyes?
What is the difference between ‘seeing’ and ‘perceiving’?
Knowledge Issue Concepts: Context, Expectations, Visual Grouping, Figure/Ground, Unconscious Activity
Optical Illusions
The way we see something depends partly on the context in which we see it.
Consider a man holding a bloody knife…how could context change our perception of what are eyes ‘see’?
Issue #1: Context
What we expect to see influences what we do see
This perceptual error is far from uncommon
Look at the image to the right…is there anything wrong?
Issue #2: Expectations
What cards do you see?
Issue #2: Expectations
We have a natural tendency to look for meaning in what we see and to group our perceptual experiences together into shapes and patterns
Shapes in clouds Man in the Moon
Issue #3: Visual Grouping
We tend to ‘highlight’ certain aspects of what we see (‘figure’) and treat the rest as background (‘ground’)
Allows reading and other forms of focused attention
Issue #4: Figure/Ground
We suffer not only from visual illusions, but also from illusions with each of our other senses. Can you give some examples of illusions with hearing, touch, taste, and smell?
Time-Out!
Many interpretations we routinely make are on an unconscious level
Ex. Image of someone approaching from down a hallway
Ex. Our face in the mirror
Issue #5: Role of the Unconscious