It's more about escape velocity. Your neural signals would not be able to escape to an observer "outside" the black hole -- I mean outside most of its gravitati

It's more about escape velocity. Your neural signals would not be able to escape to an observer "outside" the black hole -- I mean outside most of its gravitational influence -- but they could move around locally. The larger the black hole, the smaller the tidal forces at the event horizon, so with a large enough black hole, a human body would be fine.