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The first good
evidence linking the amygdala and related
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temporal lobe
structures to emotion was obtained in
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1939 by Heinrich
Kluver and Paul Bucy. They removed
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the temporal
lobes, including the amygdala and
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hippocampus,
bilaterally in monkeys. They
observed a
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dramatic change
in emotional behavior:
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Monkeys became
tame, fearless, and had “blunted” emotions
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Increased oral
activity, including placing inedible objects in their
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mouth.
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They exhibited
increased sexual behavior, mounting
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inappropriate
objects.
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Subsequent
studies that made more precise lesions
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indicate that
the amygdala was a key structure mediating
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the emotional
effects.
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