Reveals Segregation of Functions across the M agnocellular vs P arvocellular Systems Properties of M vs P Neurons Contrast Sensitivity PSystem Resolves Many Levels of Gray M System ID: 930746
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Slide1
Use of
Isoluminant
Stimuli
Reveals Segregation of Functions
across the
M
agnocellular
vs.
P
arvocellular
Systems
Slide2Properties of M vs. P Neurons
Slide3Contrast Sensitivity
Slide4P-System
Resolves
Many
Levels of Gray
Slide5M
-System
Resolves
Few
Levels of Gray
Slide6Isoluminant
Stimulus Paradigm
Slide7Flicker Photometry Stimuli
Slide8Counter-Phase Red/Green Flicker
Slide9Increase Flicker Rate
Until Color Fusion Threshold
Color fusion threshold usually around 12-15 Hz.
Slide10Adjust 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.
Slide11Depth/Size Scaling
Size Constancy
Ponzo
Illusion
Muller-
Lyer
Illusion
Texture Gradients
Stereopsis
Motion Parallax
Slide12Size Constancy
Slide13Ponzo
Illusion
Slide14Müller-
Lyer
Illusion
Slide15Green-on-Red Stimulus Format
Slide16Depth/Distance from Texture Gradients
Slide17Depth from Motion Parallax
(
Youtube
Demo)
Slide18Motion Analysis
Structure from Motion
Synchronized Apparent Motion
(Grouping by Proximate Motion)
Slide19Structure from Coherent Motion
http://www.michaelbach.de/ot/col_equilu/index.html
Slide20Grouping by Motion
Frame-1
Frame-2
Slide21Grouping by Motion
Slide22Grouping by Motion
Slide23Grouping by Motion
Slide24Figure/Ground Segregation
Rubin’s Vase
Subjective Contours
(
Kaniza
figures)
Slide25Rubin’s Vase
Slide26Subjective Contours
Slide27Subjective Contours
Slide28Object Perception
Binding Primitive Features into Objects
Grouping by
Colinearity
(AI: “Block World”)
Slide29Grouping by
Colinearity
(“Block World”)
Slide30Appendix
Slide31