02/18/2014 10:57 am ET

Itching: More Than Skin-Deep

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The experiment was not for the squirmish. Volunteers were made to itch like crazy on one arm, but not allowed to scratch.Then they were whisked into an M.R.I. scanner to see what parts of their brains lit up when they itched, when researchers scratched them and when they were finally allowed to scratch themselves.

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