Are you being brainwashed? Eerie truth behind viral ‘hidden messages’ in sound and why you hear them

Clips of thin, whistling tones are going viral on social media, startling listeners who suddenly “hear” hidden words. The sound itself doesn’t change; once listeners know the sentence, their brains impose meaning, transforming whistles into intelligible speech. Known as sine-wave speech (SWS), the phenomenon shows how perception, expectation, and auditory priming shape what we hear, not secret messages or conspiracies.

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