Isoluminant Stimuli Reveals Segregation of Functions across the M agnocellular vs P arvocellular Systems Properties of M vs P Neurons Contrast Sensitivity PSystem Resolves Many ID: 285631
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Slide1
Use of
Isoluminant
Stimuli
Reveals Segregation of Functions
across the
M
agnocellular
vs.
P
arvocellular
Systems
Slide2
Properties of M vs. P NeuronsSlide3
Contrast SensitivitySlide4
P-System
Resolves
Many
Levels of GraySlide5
M
-System
Resolves
Few
Levels of GraySlide6
Isoluminant
Stimulus Paradigm
(Simplified B&W Camera Analogy)Slide7
Flicker Photometry StimuliSlide8
Counter-Phase Red/Green FlickerSlide9
Increase Flicker Rate
Until Color Fusion Threshold
Color fusion threshold usually around 12-15 Hz.Slide10
Adjust Intensity of Green Stimulus
Until Luminance Flicker Minimized
The values of the Red and Green stimuli at the point of complete flicker fusion
e
stablishes the ISOLUMINANT POINT for the current observer.Slide11
REMEMBER
:
The
M-system
is insensitive to
Isoluminant
StimuliSlide12
ASSUMPTION
:
Perceptual Abilities Lost
under
IsoLuminant
Conditions
are Mediated by the
M-systemSlide13
Depth/Size Scaling
Size Constancy
Ponzo
Illusion
Muller-
Lyer
Illusion
Texture Gradients
Stereopsis
Motion ParallaxSlide14
Size ConstancySlide15Slide16
Ponzo
IllusionSlide17
Müller-
Lyer
IllusionSlide18
Green-on-Red Stimulus FormatSlide19
Depth/Distance from Texture GradientsSlide20
Depth from Motion Parallax
3D via Head Tracking DemoSlide21
Motion Analysis
Structure from Motion
Synchronized Apparent Motion
(Grouping by Proximate Motion)Slide22
Structure from Coherent Motion
http://www.michaelbach.de/ot/col_equilu/index.htmlSlide23
Grouping by Motion
Frame-1
Frame-2Slide24
Grouping by MotionSlide25
Grouping by MotionSlide26
Grouping by MotionSlide27
Figure/Ground Segregation
Rubin’s Vase
Subjective Contours
(
Kaniza
figures)Slide28
Rubin’s VaseSlide29
Subjective ContoursSlide30
Subjective ContoursSlide31
Object Perception
Binding Primitive Features into
Objects
Grouping by
Colinearity
(AI: “Block World”)Slide32
Grouping by
Colinearity
(“Block World”)Slide33
AppendixSlide34