Research found that the 13 volunteers experienced 'inattentional deafness' to the normal-volume sounds playing in the background as their visual tasks became increasingly difficult.

'We found that when volunteers were performing the demanding visual task, they were unable to hear sounds that they would normally hear,' study co-author Maria Chait said in a statement.

'The brain scans showed that people were not only ignoring or filtering out the sounds, they were not actually hearing them in the first place.'

The findings, published in the Journal of Neuroscience, suggest that the visual and auditory processing centers that make sense of the sights and sounds that surround us share limited resources.

Inattentional deafness is a common every day experience and the study explains why, according to UCL Institute of Cognitive2 Neuroscience Professor Nilli Lavie, a co-author of the study.

'If you try to talk to someone focusing on a book, game, or television program and don't receive a response, they aren't necessarily ignoring you, they simply might not hear you!' she said.

'This could also explain why you might not hear your bus or train stop being announced if you're concentrating on your phone, book, or newspaper.'

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