They would make this change so quickly that they would hear the word they had been trying to say in their headphones. When participants would hear themselves making the wrong sound, they would change the sound they were saying (to a lower frequency sound like “bid”). Participants would say a word like “bed” and through the headphones – so quickly that it seemed like they were hearing the word as they spoke it – the researchers would alter the frequency of the sound to make the participant hear “bad.” Scientists have found that your brain can use this kind of real-time feedback with the information you hear so quickly that it can change the sounds coming out of your mouth.īy using headphones that would change the speech sounds people heard themselves making as they made them, researchers were able to trick people’s brains into believing that they were making a speech error. Your brain is integrating the information from the video quickly enough that it changes the phoneme you perceive in real time. Take a moment to realize how quickly this change is happening to what you hear. Try it with your eyes open and your eyes closed. This BBC video will not only explain the details, but it will provide examples you can use right from home.
Even though the sounds being played did not change (such as repeating “ba, ba, ba, ba,” watching the lip movements for an “f” sound at the same time actually results in the listener hearing “fa, fa, fa, fa.” When the sound for one phoneme (smallest units of sound for a language) was played at the same time that the person on the video was making the lip movements for a different phoneme, the sound that the listener perceived actually changed. What you hear won’t change depending on whether your eyes are closed or open … or will it? Scientist Harry McGurk and his research assistant John MacDonald found a difference when they put the audio from one recording to the video for another recording in 1976. You are listening to someone repeat the same sound over and over and you open and close your eyes. It turns out that when scientists study what we hear in more detail, what we see affects what we hear and what we hear actually affects how we speak! Then release your nostrils and you will be able to see how the flavors change from very simple (sour or sweet) to tasting like you would normally expect. Try tasting juice, fruit candy, or gum first while holding your nose closed. Some of this is easy to believe – like the ability to smell affecting your sense of taste when you have a bad cold. The sensory inputs that we receive from our bodies interact with each other in our brains to provide us with much more information than we would receive keeping everything in isolation. When scientists study our senses, they find that things are a bit more complicated. We smell with our noses, taste with our tongues, see with our eyes, touch with our skin, and listen with our ears … right? Everyone learns about the senses from when we are very young.
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