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Performance
deteriorates in some unexpected ways
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when the brain
is damaged. This can tell us a lot about
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how information
is processed.
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Damage
to the right hemisphere can cause neglect of
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the
left half of visual space and a lack of a sense of
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ownership
of body parts.
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Damage
to parts of the infero-temporal cortex can
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prevent
face recognition.
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Damage
to other areas can destroy the perception of
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color
or of motion.
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Before brain
scans, the performance deficits caused by
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physical damage
were the main way to localize functions
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in the human
brain
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recording from human brain cells is not
usually
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allowed
(but it can give surprising results!).
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