Use of Isoluminant Stimuli Reveals Segregation of Functions across the Magnocellular vs. Parvocellular Systems.

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Presentation transcript:

Use of Isoluminant Stimuli Reveals Segregation of Functions across the Magnocellular vs. Parvocellular Systems

Properties of M vs. P Neurons

Isoluminant Stimulus Paradigm

Flicker Photometry Stimuli

Counter-Phase Red/Green Flicker

Increase Flicker Rate Until Color Fusion Threshold Color fusion threshold usually around 12-15 Hz.

Adjust Intensity of Green Stimulus Until Luminance Flicker Minimized The values of the Red and Green stimuli at the point of complete flicker fusion establishes the ISOLUMINANT POINT for the current observer.

Contrast Sensitivity

P-System Resolves Many Levels of Gray

M-System Resolves Few Levels of Gray

Depth/Size Scaling Size Constancy Ponzo Illusion Muller-Lyer Illusion Texture Gradients Stereopsis Motion Parallax

Size Constancy

Ponzo Illusion

Müller-Lyer Illusion

Green-on-Red Stimulus Format

Depth/Distance from Texture Gradients

Depth from Motion Parallax (Youtube Demo)

Motion Analysis Structure from Motion Synchronized Apparent Motion (Grouping by Proximate Motion)

Structure from Coherent Motion http://www.michaelbach.de/ot/col_equilu/index.html

Grouping by Motion Frame-1 Frame-2

Grouping by Motion

Grouping by Motion

Grouping by Motion

Figure/Ground Segregation Rubin’s Vase Subjective Contours (Kaniza figures)

Rubin’s Vase

Subjective Contours

Subjective Contours

Object Perception Binding Primitive Features into Objects Grouping by Colinearity (AI: “Block World”)

Grouping by Colinearity (“Block World”)

Appendix