Inattentional Blindness
You can stare right at something and not see it
Inattentional blindness is the failure to see something fully visible when your attention is focused elsewhere. In the famous demonstration, viewers asked to count basketball passes routinely miss a person in a gorilla suit walking through the scene. Your eyes take in far more than your brain consciously processes, and attention is what determines what reaches awareness.
This is one of the leading causes of car-bicycle collisions. Drivers often genuinely don't see the cyclist they hit. Their attention was set to "car-shaped object," and a bicycle didn't match the pattern, so their visual system never flagged it. They were looking right at the road and registered nothing. Whatever your attention isn't picking effectively doesn't exist for you, which is why building in deliberate "reset" moments matters in any task that demands sustained focus.
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Inattentional Blindness