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Visual Perception (The Gestlalt Principles
Many stimuli are ambiguous
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Visual Perception
The Gestlalt Principles
- Many stimuli are ambiguous
- Interpretation happens quickly
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Perception of depth
- Important in different circumstances
- Flexible
- Versatile
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Monocular Cues
- How much the lenses of our eyes adjust
- More adjustment for closer objects
Eg: Parallel lines converge as they get farther away
Depth through Motion
- Pattern of motion in retinal images
Visual System
- Eyes
- Knowledge acquired through vision
- Process starts with light #
Photoreceptors
Bipolar cells
Ganglion Cells
Optic Nerve
Thalamus
- Lateral geniculate nucleus (LGN)
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Lateral Inhibition
- Pattern when stimulated cells inhibit activity of neighboring cells
- Helps us to distinguish edges of an object
Edge Detectors
- Helps detect the edge of objects
- Inhibits activity of neighboring to strengthen signals to the brain in a certain area
- Fire at their maximum only for stimuli at certain orientations
- The further away from preferred orientation, the slower the firing
Rods
- Sensitive to low light
- Lower acuity
- Color-blind
- Dominant in retina
- Periphery
Cones
- Sensitive to color
- Higher acuity
- Color-sensitive
- Dominant in fovea
- Center
Parallel Processing
- Detect shape, color, speed, direction, etc. at once
- Neither process has priority while being processed
The "what" and "where" system # #
"What" system
- Helps in identification of objects
"Where" system
- Helps in location of objects
The binding problem
- How is parallel processed information put back together