properties of m vs. p neurons
DESCRIPTION
Use of Isoluminant Stimuli Reveals Segregation of Functions across the M agnocellular vs. P arvocellular 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. - PowerPoint PPT PresentationTRANSCRIPT
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Use of Isoluminant StimuliReveals Segregation of Functions
across theMagnocellular vs. Parvocellular
Systems
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Properties of M vs. P Neurons
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Contrast Sensitivity
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P-SystemResolves
ManyLevels of Gray
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M-SystemResolves
FewLevels of Gray
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Isoluminant Stimulus Paradigm(Simplified B&W Camera Analogy)
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Flicker Photometry Stimuli
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Counter-Phase Red/Green Flicker
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Increase Flicker Rate Until Color Fusion Threshold
Color fusion threshold usually around 12-15 Hz.
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Adjust Intensity of Green StimulusUntil Luminance Flicker Minimized
The values of the Red and Green stimuli at the point of complete flicker fusionestablishes the ISOLUMINANT POINT for the current observer.
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REMEMBER:
The M-system is insensitive toIsoluminant Stimuli
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ASSUMPTION:
Perceptual Abilities Lostunder IsoLuminant Conditionsare Mediated by the M-system
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Depth/Size Scaling
• Size Constancy• Ponzo Illusion• Muller-Lyer Illusion• Texture Gradients
• Stereopsis• Motion Parallax
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Size Constancy
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Ponzo Illusion
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Müller-Lyer Illusion
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Green-on-Red Stimulus Format
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Depth/Distance from Texture Gradients
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Motion Analysis
• Structure from Motion
• Synchronized Apparent Motion(Grouping by Proximate Motion)
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Structure from Coherent Motion
http://www.michaelbach.de/ot/col_equilu/index.html
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Grouping by Motion
Frame-1 Frame-2
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Grouping by Motion
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Grouping by Motion
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Grouping by Motion
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Figure/Ground Segregation
• Rubin’s Vase
• Subjective Contours(Kaniza figures)
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Rubin’s Vase
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Subjective Contours
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Subjective Contours
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Object Perception
• Binding Primitive Features into Objects
• Grouping by Colinearity(AI: “Block World”)
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Grouping by Colinearity(“Block World”)
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Appendix
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