Watched a scary movie last night and reminded me of that feeling when you sense someone or something approaching you from behind.
In: Biology
You see a shadow, hear a faint noise, a whiff of odor, feel body heat or the stirring of the air. Often the alarm of someone appearing unexpectedly behind will make you forget exactly what sensation alerted you.
Confirmation bias plays a role as well. You remember all the times when you sensed someone they were there, and forget when it was a false alarm.
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