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Fun fact: this is (I believe?) an example of something called the McGurk Effect, which is the phenomenon where you incorporate visual stimuli into your auditory perception. Usually this takes the form of lipreading influencing what you hear (if you listen to a "ba" sound but see lips forming "va" "tha" or "la" sounds you'll hear those instead of "ba") but these sorts of visual inputs work too. This is because your brain incorporates multiple types of sensory input into almost every "sense" we thing of. Examples include but are not limited to: hearing is a combination of auditory and visual stimuli, taste is a combination of gustatory and olfactory inputs, and sight is a combination of visual and equilibrioceptive (balance) inputs. This is, more broadly, called multimodal sensory integration. (I teach this in my physiology class so I might actually search for the source of this video and use it in a lecture because it's actually a great demonstration of this)
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