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McGurk effect

PHONETICS: The McGurk effect was discovered by the psychologists McGurk and MacDonald by accident when they dubbed an audio syllable "ba" onto a visual "ga". When the tape was played, "da" was perceived. They realised that "da" resulted from an audio-visual illusion, that has become known as the McGurk effect or McGurk illusion. Also see: speechreading.

McGurk effect demonstration