"I have a theory about that!" Senku said brightly because of course he did. "What's most fascinating about the petrification is its ability to repair damage to cells. It can reverse fatal wounds, and also affects neurological conditions...the only thing it can't fix is anything congenital." He explained.

"So I suspect that whatever damage was caused by the total sensory deprivation with nothing but my brain firing thoughts and constant counting, was repaired by my revival." He understood the implications. "Because that period of time wasn't the worst. By far, what was the worst, was the six months I spent alone ambulatory after that."

That was what gave him panic attacks and lived in his nightmares. "My friend woke up after that, so I was able to engage in social interaction at that point."

He'd been talking to animals. It was bad.