[tezzer]

I was a guinea pig for this experiment- they spun us up in the centrifuge, vibrated the chair in a simulation of launch forces, and had us doing reading and manual tasks. There are parts of your brain that nope out at certain frequencies, it's a remarkable feeling.

[j_crick]

Can you tell a bit more about how it actually felt? :)

[tezzer]

The centrifuge itself- you get a little nausea as it spins up, and then it feels like forward Gs; an elephant sitting on you or the bottom of a dip in a roller coaster that never stops. Even at higher Gs it's just a continuous crushing that makes it arduous to breathe, but they never spun us civilians up to the point that anything seemed life threatening.

But then on some of the vibration runs (they did a bunch of different frequencies), there was this overwhelming all-focusing urgent need to make it stop. It just felt wrong, and dangerous, and there wasn't room in the head for anything but this worry that something dreadfully wrong was happening. It pushed out any other thoughts.

The target runs (and this was a decade ago so I'm dragging through memory) were mostly just visual effects, though. Everything was bouncing around and you couldn't focus on anything well enough to read; and there was a bit of the worry in my thoughts but not the panic from other frequencies.