Deafness in early childhood is known to lead to lasting changes in how sounds are processed in the brain, but new research published today in eLife shows that even mild-to-moderate levels of hearing loss in young children can lead to similar changes.
Researchers say that the findings may have implications for how babies are screened for hearing loss and how mild-to-moderate hearing loss in children is managed by healthcare providers.
The structure and function of the auditory system, which processes sounds in the brain, develops throughout childhood in response to exposure to sounds. In profoundly deaf children, the auditory system undergoes a functional reorganisation, repurposing itself to respond more to visual stimuli, for example. However, until now relatively little was known about the effects of mild-to-moderate hearing loss during childhood.
A research team led by Dr Lorna Halliday, now at the MRC Cognition and Brain Sciences Unit, University of Cambridge, used an electroencephalogram (EEG) technique to measure the brain responses of 46 children who had been diagnosed with permanent mild-to-moderate hearing loss while they were listening to sounds.
Dividing the children into two groups – younger children (8-12 years) and older children (12-16 years) – the team found that the younger children with hearing loss showed relatively typical brain responses – in other words, similar to those of children with normal hearing. However, the brain responses of older children with hearing loss were smaller than those of their normally hearing peers.
To confirm these findings, the researchers re-tested a subset of the group of younger children from the original study, six years later. In the follow-up study, the researchers confirmed that as the children with hearing loss grew older, their brain responses changed. Responses that were present when the children were younger had either disappeared or grown smaller by the time the children were older. There was no evidence that the children’s hearing loss had worsened over this time, suggesting instead that a functional reorganisation was occurring.
The full article can be read here: https://www.cam.ac.uk/research/news/mild-to-moderate-hearing-loss-in-children-leads-to-changes-in-how-brain-processes-sound
Calcus, A et al. Functional Brain Alterations Following Mild-to-Moderate Sensorineural Hearing Loss in Children. eLife; 1 October 2019; DOI: 10.7554/eLife.46965
For more information please contact Lorna Halliday