Informative+Speech-PowerPoint-Lucero+Calleo-1

Informative+Speech-PowerPoint-Lucero+Calleo-1 -...

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    Optical Illusions Lucero Calleo
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Introduction What exactly is an optical illusion? “A misinterpretation of a visual stimulus.” (Kalat) Eyes see correctly, but the mind does not interpret correctly Understanding how the mind works Müller-Lyer Illusion Controversy over explanation
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The Eye Light waves enter each eye through pupils, and brain interprets light Receptors Cells that convert energies to signals Many kinds E.g. cones – color
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Reversible/Ambiguous Figures Gestalt Psychology Seeks to explain how we perceive overall patterns (Kalat) Without enough info, brain cannot decide how to interpret the image If it sees one feature as a nose, it groups everything else accordingly
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Illusions: Brightness and Contrast Negative Afterimages Opponent Process Theory System of paired opposites (Kalat) Red and Green Blue and Yellow White and Black
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White parts make light detectors tired because they are bright We see black where the light receptors have been worn out (sciencealive.ca)
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Brightness and Contrast (cont.) Adelson Checkerboard Shadow Illusion
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Object’s brightness and contrast seem to change because of surrounding objects (sciencealive.ca)
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Illusions: Movement Perception Snake Illusion Corner of your eye (Akiyoshi Kitaoka) Darker to lighter regions
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Copyright A.Kitaoka 2003
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Movement Perception (cont.) Waterfall Illusion
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Informative+Speech-PowerPoint-Lucero+Calleo-1 -...

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