An Audio- Visual Illusion - The McGurk Effect - 11/52

audio illusion

I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

This week an audible illusion. The McGurk effect is a cross-modal effect resulting from conflicting information coming from different senses, namely sight and hearing.

Watch the video and listen to the speech. Do the sounds produced by the man change throughout the video?

McGurk effect is a cross-modal effect and illusion that results from conflicting information coming from different senses, namely sight and hearing.

The effect was discovered by Harry McGurk and John MacDonald, and was published inNature in 1976. The illusion can be observed when one is asked to watch a video of lip movements alongside listening to sounds uttered, apparently by the same person whose lip movements one is watching. If the lip movements and the sounds do not match—for example, if the lip movements indicate a “ba-ba” sound, whereas the auditory information is that of “ga-ga”—one typically experiences an illusory third sound—for example “da-da”. McGurk and MacDonald hypothesise that the effect is due to the fact that the brain is trying to make a “best guess”, given the information that is coming from different senses is contradictory. The effect is reported to be particularly salient when the quality of auditory information is poor, in which case the visual information trumps the auditory information (Massaro & Cohen 2000).

What are the best optical illusions you've found on the web? Do you have more amazing examples you don't see here?

Share your thoughts with us in the comments section below.