Scientists find why scratching an itch feels so good
Scratching can reduce activity in areas of the brain associated with unpleasant emotions
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Friday, 01, Feb 2008 01:42
Scientists have used brain scanning techniques to discover why it is so satisfying to scratch an itch, according to a new report.
The team from Wake Forest University Baptist Medical Centre say understanding the mechanism of relief could help to develop more effective treatments.
Their study used magnetic resonance imaging (MRI) technology that highlights areas of the brain activated during an activity.
Thirteen healthy participants were scratched on the lower leg with a small brush for 30-second periods up to a total of five minutes.
Writing in the online edition of the Journal of Investigative Dermatology, the researchers say they found that areas of the brain associated with unpleasant emotions and memories became significantly less active during the scratching.
"We know scratching is pleasurable, but we haven't known why," said lead author Dr Gil Yosipovitch.
"It's possible that scratching may suppress the emotional components of itch and bring about its relief."
When participants reported that the scratching felt most intense, activation in two areas was lowest.
These were the anterior cingulated cortex, an area associated with aversion to unpleasant sensory experiences, and the posterior cingulated cortex, which is associated with memory.
"Of course, scratching is not recommended because it can damage the skin," Dr Yosipovitch commented.
"But understanding how the process works could lead to new treatments. For example, drugs that deactivate this part of the brain might be effective."