It’s a maddening cycle that has affected us all: it starts with an itch that triggers scratching, but scratching only makes the itchiness worse. Now, researchers have revealed the brain mechanism driving this uncontrollable itch-scratching feedback loop. Researchers showed that the activity of a small subset of neurons, located in a deep brain region called the periaqueductal gray, tracks itch-evoked scratching behavior in mice.
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