the structuralist approach · the gestalt approach • according to gestalt psychologists, the...
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The Structuralist Approach
• Approach established by Wundt (1830-1920)
– States that perceptions are created by combining elements calledsensations
– Popular in mid to late 19th century
Wundt studied conscious experience by examining its structure or components parts (sensations, feelings) using individuals who were trained in introspection. This "school of psychology" became known as structuralism.
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–Structuralism could not explain ‘apparent motion’
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–Structuralism could not explain ‘apparent motion’
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–Structuralism could not explain ‘illusory contours’ either.
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It seems that the visual system ‘looks’ for regularity and patterns.We often ‘see’ or infer structure when it’s not actually there.
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The Gestalt Approach
• According to Gestalt psychologists, the whole is different than the sum of its parts. Gestalt is a German word meaning configuration or pattern.
• Perception is not built up from sensations but is a result of perceptual organization
• Gestalt principles do not make strong enough predictions to qualify as “laws”
– They are better thought of as heuristics - “best guess rules”
The following ‘laws’ describe heuristics for how elements in a scene tend to group together.
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The Gestalt laws of perceptual organization
Pragnanz: Every stimulus pattern is seen in such a way that the resulting structure is as simple as possible.
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The Gestalt laws of perceptual organization
Similarity: Similar things appear to be grouped together.
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The Gestalt laws of perceptual organization
Similarity: Similar things appear to be grouped together.
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The Gestalt laws of perceptual organization
Good continuation: Points that, when connected, result in contours. These contours follow the smoothest path.
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The Gestalt laws of perceptual organization
Good continuation: Points that, when connected, result in contours. These contours follow the smoothest path.
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The Gestalt laws of perceptual organization
Good continuation: Points that, when connected, result in contours, and these contours follow the smoothest path.
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Neurons in V1 seem to support ‘good continuation’
1 2 3 4 5 6 7 8
Improvement in visual sensitivity by changes in loc al context: Parallel studies in human observers and in V1 of alert monkeys Kapadia, Ito, Gilbert, and Westheimer Neuron,1995
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The Gestalt laws of perceptual organization
Proximity – (nearness) things that are near to each other are grouped together
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The Gestalt laws of perceptual organization
Proximity vs. Similarity Which one wins?
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The Gestalt laws of perceptual organization
It depends…
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The Gestalt laws of perceptual organization
Common Fate – things that move together belong together
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The Gestalt laws of perceptual organization
Common region - elements in the same region tend to be grouped together
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The Gestalt laws of perceptual organization
Uniform connectedness – a connected region of visual properties is perceived as single unit
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The Gestalt laws of perceptual organization
Synchrony - elements occurring at the same time are seen as belonging together.
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The Gestalt laws of perceptual organization
Meaningfulness or Familiarity- Things are more likely to form groups if the groups appear meaningful or similar.
Bev Doolittle (1985)
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Pareidolia (payr.eye.DOH.lee.uh) n. The erroneous or fanciful perception of a pattern or meaning in something that is actually ambiguous or random.
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On Mars
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On the Moon
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On (Google) Earth
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In smoke and fire and snow
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In smoke and fire and snow
October 16, 2007: Is this Pope John Paul II waving from beyond the grave? Vatican TV director says yes
This fiery figure is being hailed as Pope John Paul II making an appearance beyond the grave.
The image, said by believers to show the Holy Father with his right hand raised in blessing, was spotted during a ceremony in Poland to mark the second anniversary of his death.
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In rocks
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In trees
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On food.
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Do cars have faces?
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Figure-Ground Segregation
• Determining what part of environment is the figure so that it “stands out” from the background
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Figure-Ground Segmentation
Figure is usually:
In the lower part of the display
Symmetric
Convex
Relatively small in area
Oriented vertically rather than obliquely
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Figure-Ground Segregation
Elements located in the lower part of displays tend to be seen as figure.
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Area
Smaller areas tend to be perceived as figure.
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Vertical and horizontal components tend to be perceived as figure.
Area and orientation compete here
Orientation
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Smaller areas (the black shapes) tend to be perceived as figure.