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which one believes that their friends and loved ones
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have been replaced by imposters.
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Sort of like "Invasion of the body snatchers."
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It typically involves only one sense, such as sight.
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Basically, the neural connection between the visual cortex
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and the emotional center of the brain becomes severed,
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so that looking at a loved one doesn't elicit
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the same emotional response one would expect.
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So you think they're an imposter.
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And the interesting thing is that
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the auditory connection remains intact,
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so that if they were to hear a loved one speak and not see them,