Scientists tickle rats to learn about brain activity during play

Here Is a Man Tickling Rats for Science -- Science of Us

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Rats avoid harming other rats. The finding may help us understand sociopaths.

Rats have a 'laugh centre' in their brains that responds to tickling

Adorable Experiment Proves Rats Love to Be Tickled! — Animal Hearted Apparel

Neural correlates of ticklishness in the rat somatosensory cortex

Giggling Indicates If Rats Actually Enjoy Being Tickled

Rats are ticklish when their mood is right

Rats tickled past squeaking point to identify the brain's tickle center

Rats are really good at hide-and-seek — and they get a kick out of it: study

To reveal how the brain creates joy, start by tickling rats