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Visual Illusions. Visual Illusions. Definition Illusions occur when what we see does not correspond to what is physically present in the world. Brightness After Effect. Please Stare for a while. Colour After Effect. +. Please Stare for a while. Negative Colour After Images. +.

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Visual illusions1
Visual Illusions

Definition

Illusions occur when what we see does not correspond to what is physically present in the world


Brightness after effect
Brightness After Effect

Please Stare for a while


Colour after effect
Colour After Effect

+

Please Stare for a while




The z llner illusion orientation contrast
The Zöllner Illusion (Orientation Contrast)


The z llner illusion orientation contrast1
The Zöllner Illusion (Orientation Contrast)


Size distance relationship
Size-Distance Relationship

Object size is inferred from perceived distance and retinal image size

If 2 objects have the same retinal image size (i.e., are the same real size), the object appearing further away is seen as larger



The ponzo illusion
The Ponzo Illusion

Gregory’s theory

The visual system makes hypotheses about distance to objects based on evidence in the image. Interpretation of size follows.



M ller lyer illusion1
Müller-Lyer Illusion

0

0

5

5

10

10

Objectively equal in separation, perceptually different


M ller lyer illusion2
Müller-Lyer Illusion

0

5

10

15

Perceptually equal in separation, objectively 30% different


M ller lyer illusion3
Müller-Lyer Illusion

Perspective cues set up false interpretations of distance



Ames room1
Ames room

Ames room sets up false distance cues

Objects that are different distances appear the same distance



Necker cube
Necker cube

Look at the red dot…

It can be either on a near corner or a far corner


Ambiguous figures
Ambiguous figures

Old woman looking down/young woman looking away







Escher s prints
Escher’s prints

The brain cannot compute 3-D structure from all parts at once, each part looks plausible in isolation





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