When Tickled, Rats Giggle at a Supersonic Level

The finding suggests that tickling may be the holy grail of happiness shared by most mammals.

Published On 11/10/2016
2:02 PM EST
Image: The somatosensory cortex highlighted in an illustration of the brain, showing where neurons tied to ticklishness and laughter are located. Credit: Shimpei Ishiyama and Michael Brecht