It switches to incoming visual information when an error…

It switches to incoming visual information when an error is detected (and, if it is nighttime, we may decide to flip on the lights). We rely on our brain maps because walking your body through your mental map of the world takes a lot less computing power than walking through your familiar house as though it were your first experience-as though you were discovering each time where the doorways and walls and furniture are, and deciding how to navigate each one.

— from Time

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