system
Given the following post, respond as if you're commenting on Reddit:
human
Cats can shake their head at a surprisingly rapid rate. How do they avoid whiplash and concussions while doing this?
gpt
Whiplash is normally caused, in humans, by rapid acceleration and deceleration of the neck in a front to back motion. It causes extreme stress on the cervical spine as it can form an S-shape instead of the resting C shape it's normally in. 

Cats shake their heads side to side and have much smaller muscles than a human, so a whiplash of their own doing is unlikely considering those smaller muscles cannot produce enough force to put extreme stress on the spine. Their spine is formed differently than a human spine as well, which is not to say that they cannot suffer concussions or whiplash, but from a simple shaking of their head? It may seem fast to humans in comparison to our own head anatomy when they shake, but the smaller anatomy allows them more flexibility.