brainlock en · NOUN
Etymology
From brain + lock.
Meanings
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(informal, uncountable) The situation where a person's brain seems to freeze up, preventing them from proceeding.
Pilots worry about "brainlock" — that sickening sensation when you pull out of a vertical dive at near 200 mph and have no idea what figure comes next.
1991, Air & Space Smithsonian, volume 6, page 78:Another, more disturbing reason for no-pulls is what skydivers call brainlock. Jumping out of a plane with your heart pounding and stress hormones pumping, it's no surprise that your mind can freeze up for a few seconds.
2009, Ben Sherwood, The Survivors Club: The Secrets and Science that Could Save Your Life: