Based on a perceptual phenomenon called the McGurk effect, our brains interpret what we hear based not only on audio input, but also on visual input. Therefore if the person speaking to you mouths the word “fa” while speaking the word “ba” you will only hear the word your brain visually interprets. Unlike optical illusions which can cease to work after you’ve figured them out, the McGurk effect is pretty much impossible to get around; that is, unless you close your eyes…
This phenomenon is certainly not a recent discovery, but not a whole lot of people are aware of it. Check out the BBC video below. It explains the concept much better than we ever could!
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