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lipreading is a solution to communication for the deaf and people with hearing problem. lipreader normally observes lip movements, facial mimicking and body language to gain understanding about what the speaker is try to say. However, some people with normal vision and hearing do unconsciously use lipreading to gain information from others. Each speech sound (phoneme) has a particular facial and mouth position (viseme), although many phonemes share the same viseme and thus are impossible to distinguish from visual information alone. Here comes in the interesting perceptual phenomenon known as McGurk effect.

Below shows the explaination of McGurk effect from wikipedia,

McGurk effect may be experienced when a video of one phoneme's production is dubbed with a sound-recording of a different phoneme being spoken. Often, the perceived phoneme is a third, intermediate phoneme. For example, a visual /ga/ combined with a heard /ba/ is often heard as /da/. Further research has shown that it can exist throughout whole sentences. The effect is very robust; that is, knowledge about it seems to have little effect on one's perception of it. This is different from certain optical illusions, which break down once one 'sees through' them.

To have a clear understanding, watch the youtube clip below,

References

1. McGurk effect, retrieved 10 October 2008, from
http://en.wikipedia.org/wiki/McGurk_effect

2. Lip reading, retrieved 10 October 2008, from
http://en.wikipedia.org/wiki/Lip_reading

3. McGurk Effect (with explanation), retrieved 10 October 2008, from
http://www.youtube.com/watch?v=jtsfidRq2tw&feature=related

posted by Seet Joyi @ 10:52 PM

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