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An illusion is a distortion of a sensory perception,
revealing how the brain normally organizes and interprets
sensory stimulation. While illusions distort reality,
they are generally shared by most people. Illusions
may occur with more of the human senses than vision,
but visual illusions, optical illusions, are the
most well known and understood. The emphasis on
visual illusions occurs because vision often dominates
the other senses. For example, individuals watching
a ventriloquist will perceive the voice is coming
from the dummy since they are able to see the dummy
mouth the words. Some illusions are based on general
assumptions the brain makes during perception. These
assumptions are made using organizational principles,
like Gestalt, an individual's ability of depth perception
and motion perception, and perceptual constancy.
Other illusions occur because of biological sensory
structures within the human body or conditions outside
of the body within one·s physical environment... |
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