What does “unterschwellig” mean in German?

The video explains déjà vu: “ein Déjà vu eintritt, wenn unser Gehirn eine Umgebung unterschwellig wahrnimmt” — a déjà vu happens when your brain notices its surroundings “unterschwellig,” below the level of conscious attention. Your mind takes in the room while you are focused elsewhere, so later it feels familiar without you knowing why. Use it when something quietly shapes how you feel before you have even thought about it.

Spoken in the clip: “dass ein Déjà vu eintritt, wenn unser Gehirn eine Umgebung unterschwellig wahrnimmt” — “that a déjà vu happens when our brain takes in the surroundings below our awareness.” “Unter” means under and “Schwelle” is a threshold or doorstep, so the word paints a picture: it stays under the line where you would notice it. Examples: - “Die Werbung wirkt unterschwellig.” — “The advert works on you without you noticing.” - “Ich spürte unterschwellig, dass etwas nicht stimmte.” — “Deep down, without really thinking it, I felt something was wrong.” - “Im Gespräch lag eine unterschwellige Spannung.” — “There was a quiet tension under the conversation.” It often describes feelings, messages, or signals that affect you quietly. Close in meaning to English “subconscious,” but in everyday German it just means “faint and below awareness,” not a science term.