Visual cues amplify sound

Looking at someone's lips is good for listening in noisy environments because it helps our brains amplify the sounds we're hearing in time with what we're seeing, finds a new UCL-led study. The researchers say their findings, published in Neuron , could be relevant to people with hearing aids or cochlear implants, as they tend to struggle hearing conversations in noisy places like a pub or restaurant. The researchers found that visual information is integrated with auditory information at an earlier, more basic level than previously believed, independent of any conscious or attention-driven processes. When information from the eyes and ears is temporally coherent, the auditory cortex - the part of the brain responsible for interpreting what we hear - boosts the relevant sounds that tie in with what we're looking at. "While the auditory cortex is focused on processing sounds, roughly a quarter of its neurons respond to light - we helped discover that a decade ago, and we've been trying to figure out why that's the case ever since," said the study's lead author, Dr Jennifer Bizley (UCL Ear Institute). In a 2015 study, she and her team found that people can pick apart two different sounds more easily if the one they're trying to focus on happens in time with a visual cue. For this latest study, the researchers presented the same auditory and visual stimuli to ferrets while recording their neural activity.