system
Given the following post, respond as if you're commenting on Reddit:
human
How does the brains of conjoined twins process sensation?

Like if they touch a hot surface does that immediate response to move away get sent to both brains or just one?
gpt
It depends on where and how they are conjoined. If they're conjoined at the hip through a very narrow bit of tissue they will have fully independent nervous systems. If they're conjoined at the chest they might each control an arm and share what's below since their spine is fused below a certain point. There's even a pair of conjoined twins that have interconnected brains and can see through each others' eyes.