Someone else will have to add the scientific terminology because it completely escapes me right now. Anyway, our brains are specifically wired so that if we notice something that our unconscious brain perceives as potential threat, like a fast moving and/or large object, a possible predator, or something small headed right for an eyeball, the involuntary/unconscious parts of our brains will actually bypass the thinking centers of the brain and send commands directly to the movement and fight-or-flight sections.
This is what allows reflexes to work so suddenly and quickly, and why sometimes, people will react to a perceived threat and have absolutely no idea what happened. It’s because their brain bypassed anything that required understanding or thought in order to save time and increase the chance to survive.
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