it’s a cool thing your brain does called covert attention! wikipedia has better explanation than I could muster so here you go:
“Covert orienting is the act of mentally shifting one’s focus without moving one’s eyes. Simply, it is changes in attention that are not attributable to overt eye movements. Covert orienting has the potential to affect the output of perceptual processes by governing attention to particular items or locations… does not influence the information that is processed by the senses.”
source: ‘Attention’ wiki page: ‘overt and covert orienting’ subsection
Unconscious multi-tasking. The brain actually has more processing power than the waking mind can use so with practice the brain can do things automatically while you focus on something else.
People do this all the time without realizing it. Like walking and talking or when you remember something an hour later. Martial artists and some athletes train to do this since reacting without thinking is faster than reacting while thinking. Your brain can also analyze a situation and come to conclusions without your mind realizing it. It’s where “Gut Feelings” come from.
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