McGurk Effect

What sound is this man making? Most people will describe it as "da-da" or "la-la" or even "ga-ga". Now play the video, but don't look at him. For most people, he'll now clearly be saying "ba-ba".
bigbikemansays...

Actually, it gets weirder still. The video and audio sometimes goes out of sync on my machine (thanks firefox, you resource pig). So in this particular case the audio lagged about a second behind the video. Turns out that if you don't actually see his mouth move at the *exact* time he speaks, you will still hear "ba-ba"...

Great sift.

OwenHigginssays...

For gods sake, have none of you heard of sound frequency? Pitch and frequency and wave length are all used by your ear to determine sound. Whats lacking in this video is proper audible wavelength. Your brain makes up for this when it see's how the person is moving their mouth.

Over a telephone/ radio, especially old phones it was impossible to determine P - T - C and other letters.. due to only being able to transmit a certain range of audio.. which is why words like Alpha, Bravo, Charlie, Delta, Foxtrot were used.

New study's into Dislexia have shown that some children / adults have an audible deficiency which might make it hard for them to determine sound rather than determine words.

jmzerosays...

For gods sake, have none of you heard of sound frequency? Pitch and frequency and wave length are all used by your ear to determine sound.

I guess it's technically true that your ear detects those 3 things - but it's kind of odd to say it uses all 3, as they're all, in effect, the same thing. Pitch and frequency are measuring the same thing, and detecting frequency implicitly means detecting wavelength (as they're inversely proportional).

And while it's certainly true that missing frequency (or, equivalently, wavelength or pitch) information would cause interpretation problems, that's not what's happening here. What this effect demonstrates is that, in addition to frequency, volume, and other auditory information, visual factors are used in interpreting sound.

bigbikemansays...

Sound frequency? Hmmmm. never heard of it. :rolls eyes:

What makes this interesting is *precisely* the fact that knowing what is happening doesn't negate the effect....in fact, judging by the comments here, virtually nothing you can do will neutralize the effect. And I agree with jmzero: this is not like saying p t or c on the phone because in those cases, once someone tells you which letter they're saying you can usually "hear" it properly.


loorissays...

That's bad.

You shouldn't have said how it would sound when you don't look at him, you should've just said to try it, otherwise it influences the result.

Btw when I was looking at him I thought he was saying "Anal ha"

MaxWildersays...

Since I read the description first, I clearly heard ba-ba and saw the discrepancy in the dubbing. It would probably be a better effect if the description was changed to "Read the comments after watching."

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