subliminal perception, n.All

Subliminal perception (n.) once ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠flooded a professor with childhood memories mid-conversation; walking back, he found the cause — the smell of geese from a farm they had passed.