Hearing technologies could play an important role in delaying dementia

EVENT

© The International Society of Audiology

New research into understanding how the brain adapts and improves its hearing abilities through the use of hearing technologies could play an important role in the future management of dementia. The use of devices such as hearing aids and cochlear implants to delay and/or reverse cognitive decline in conditions such as dementia was one of the topics discussed at the XXXII World Congress of Audiology in Brisbane this week.

Professor Stephen Crain (picture), from the Macquarie University describes central auditory plasticity as the adaptability of the brain’s cerebral cortex to process sound more effectively in response to new stimuli:“We now know the brain has a remarkable ability to regrow and adapt itself to process new kinds of information and relearn tasks, especially in early childhood, but across the lifespan.” The peak of brain’s central auditory plasticity occurs in children between the ages of two and four. It’s before this critical time that infants with hearing loss benefit most from being fitted with a hearing device so that the regions of the brain that processes sound information and language can develop most optimally.

“Although the brain has its greatest plasticity in very young children, it continues to have remarkable adaptive abilities at all ages." Preliminary research supports the notion that adults with hearing aids develop new neural pathways in the brain to more fully utilise the information created by these devices. To some extent this conclusion is supported by anecdotal evidence that many adults who are initially unhappy with their hearing devices suddenly report dramatic improvement a month or so later.“We don’t know yet exactly what is happening in the brains of these adults, but their observations suggest that perceptual processing changes are taking place in the brain as it adjusts to the information provided by hearing devices,” Professor Crain explained.

“It’s early days but as the degree of hearing loss is highly correlated with the risk of dementia it seems highly likely that intervention with a hearing device to restore hearing in adulthood could assist in delaying the onset of dementia.”

Source: International Society of Audiology

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