Comichão estudada

http://m.nzherald.co.nz/lifestyle/news/article.cfm?c_id=6&objectid=11816851

Citação:
"They found that a brain region called the suprachiasmatic nucleus (SCN) was highly active while the mice were watching the video.

The SCN is a tiny region in the hypothalamus that controls when animals fall asleep or wake up.

When the mouse saw other mice scratching, the brain's SCN released a chemical substance called GRP (gastrin-releasing peptide).

A previous study by the researchers found that GRP is a key chemical transmitter of 'itch signals' between the skin and the spinal cord."