There are also phenomena known as P-LOC (partial loss of consciousness) and A-LOC (almost loss of consciousness). These have been well researched and documented by the USAF/USN for many years but have only been introduced into high g training in the UK Military since the Red Arrows accident at Bournemouth. That accident report is worth a read regarding high g related loss of consciousness phenomena, as is the one pertaining to the L-M F-22 accident at Edwards a few years ago.