While the R&B classic "I Heard It Through the Grapevine" advises you to "believe half of what you see and none of what you hear," a University of Maryland study has found that seeing and hearing together speed up the brain's ability to process what someone is saying -- whether or not they're speaking the truth.
The study, published in the Proceedings of the National Academy of Sciences, combines neuroscience and linguistics to confirm for the first time that seeing the speaker talk -- called visual speech -- helps the brain process the words they are saying -- the auditory speech -- faster than if the words are heard only.