two views of perception: bottom-up processing: -low-level -feature driven top-down processing
DESCRIPTION
Two Views of Perception: Bottom-up processing: -Low-level -Feature driven Top-down processing - Knowledge driven -Unconscious inference (Helmholtz). What do you see in this picture?. Vertical Line Stimulating Receptive Field of Single Cell. Stimulation of a Single Cell by Downward Motion. - PowerPoint PPT PresentationTRANSCRIPT
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Two Views of Perception:•Bottom-up processing:
-Low-level
-Feature driven
•Top-down processing
-Knowledge driven
-Unconscious inference (Helmholtz)
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What do you see in this picture?
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Vertical Line Stimulating Receptive Field of Single Cell
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Stimulation of a Single Cell by Downward Motion
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BRIGHTNESS CONTRAST
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Stimulus
Luminance Profile
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Mach Bands - Edge Enhancement Illusion
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How the Eye Accentuates Edges
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Mach Bands
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Recording From a Single Cell of the Visual Cortex
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Frequency of Firing of Single Receptor in Response to Stimuli of Different Amplitude
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Inhibitory Effects of Stimulating Adjacent Receptor
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Simple Cell in Visual Cortex
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Complex Cell of Visual Cortex
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On-Off and Center Cells (Retina)
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How the Visual System Responds to Edges
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Lateral Inhibition
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Excitatory & Inhibitory Cells
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Which column
is largest?
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Which Line is Longer?
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Which lines are parallel?
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Are lines a and b parallel?
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Which Line is Longer?
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Which central dot is larger?
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Necker Cube
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What is This a Picture of?
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Excitatory & Inhibitory Cells
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Bottom-up Perception
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Which woman is taller?
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Binocular Cues for Depth
•Convergence
•Binocular disparity
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Monocular Cues for Depth• Interposition• Linear perspective• Height in vertical plane• Texture• Shadow• Relative motion
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Visual Angle
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Interposition. Which is closer? A or B?
B
A
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Which column
is largest?
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Linear Perspective
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Which red line is bigger?
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Which red line is bigger?Which red line is bigger?
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Linear Perspective
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Height in Visual Field
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Texture gradients
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Texture Gradient
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Which woman is taller?
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“AMES”Room
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Direction of Shadow
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Haze
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Haze
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Shading
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Relative Motion
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Moon Illusion
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Moon Illusion
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Moon Illusion
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Pop out effect
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