Get Out Your Notebooks!
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Transcript of Get Out Your Notebooks!
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Ted Talk: Optical Illusions – I think, I see, I wonder…
Perception Continued!
Get Out Your Notebooks!
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Sense Perception‘Two thirds of what we see is behind our eyes.’
- Chinese Proverb
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Sensation - material gathered from world
Interpretation - provided by our minds
Selectivity The role of the unconscious Expectations
Perception is Complex
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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
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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
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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!
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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
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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
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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
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What cards do you see?
Issue #2: Expectations
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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
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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
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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!
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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