Visual Illusions. Definition Illusions occur when what we see does not correspond to what is...
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Transcript of Visual Illusions. Definition Illusions occur when what we see does not correspond to what is...
Visual IllusionsVisual IllusionsDefinitionIllusions occur when what we see does not correspond to what is physically present in the world
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
Size-Distance RelationshipSize-Distance Relationship
The Ponzo IllusionThe Ponzo Illusion
Gregory’s theory
The visual system makes hypotheses about distance to objects based on evidence in the image. Interpretation of size follows.
Müller-Lyer IllusionMüller-Lyer Illusion
0 5 10
Objectively equal in separation, perceptually different
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Müller-Lyer IllusionMüller-Lyer Illusion
Perceptually equal in separation, objectively 30% different
0 5 10 15
Ames roomAmes room
Ames room sets up false distance cues
Objects that are different distances appear the same distance
Escher’s printsEscher’s prints
The brain cannot compute 3-D structure from all parts at once, each part looks plausible in isolation