Two Views of Perception: Bottom-up processing: -Low-level -Feature driven Top-down processing

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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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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 Presentation

Transcript of Two Views of Perception: Bottom-up processing: -Low-level -Feature driven Top-down processing

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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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Chapter 3: Neural Processing and Perception

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