Description:The McGurk Effect illustrates how we use visual clues as well as audible clues in interpreting speech. Click your mouse on the photograph above.
Play the video a few times, watching the lips of the speaker while you listen to the audio. Then close your eyes and LISTEN only.
You will notice that the speaker is saying a different syllable. This video was made with the subject saying the syllable "TAH" but the audio for the syllable "PAH" was substituted in the editing process.
The "McGurk effect" was first described by Harry McGurk and John MacDonald in "Hearing lips and seeing voices", Nature 264, 746-748 (1976).