Giggling rats help reveal how brain creates joy
To trace nerve cell response, researcher spent three years tickling rodents
![rat getting tickled](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/11/110916_ls_ticklish-rat_free.jpg?fit=860%2C460&ssl=1)
GOOCHY GOOCHY GOO Rats seem to enjoy a good tickle, which activates nerve cells in a part of the brain that detects touch.
S. Ishiyama, Michael Brecht