Ever been watching an old movie, only for the sound and action to go out of sync? Now imagine every voice is like this – even your own. That's the world PH lives in.
PH is the first confirmed case of someone who hears people speak before registering that their lips have moved. His situation is giving unique insights into how our brains unify what we hear and see.
Light and sound travel at different speeds, so when someone speaks, visual and auditory inputs arrive at our eyes and ears at different times. The signals are then processed at different rates in the brain. Despite this, we perceive the events as happening simultaneously. How this happens, however, is unclear.
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