Exploring How Hearing Impairment Shapes Dementia Risk

Study reveals a correlation between hearing impairment and distinct brain region variances, contributing to dementia.

Differences in certain brain regions linked to hearing loss may contribute to the onset of dementiaaccording to a study by the University of California San Diego and Kaiser Permanente Washington Health Research Institute, published in the Journal of Alzheimer's Disease ().

Hearing loss, which affects more than 60 percent of adults aged 70 and older, is known to be related to an increased risk of dementia.The reason for this association is not fully understood.

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People with hearing loss using hearing aids should buy cell phones carefully.

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To better understand the connection, researchers employed hearing tests and magnetic resonance imaging (MRI) to determine whether hearing impairment is associated with differences in specific brain regions.

The researchers reported that individuals enrolled in this observational study who had hearing impairment exhibited microstructural differences in the auditory areas of the temporal lobe and areas of the frontal cortex involved with speech and language processing, as well as areas involved with executive function.

Hearing Loss and the Brain's Role

"These results suggest that hearing impairment may lead to changes in brain areas related to the processing of sounds, as well as in areas of the brain that are related to attention. The extra effort involved with trying to understand sounds may produce changes in the brain that lead to increased risk of dementia," said principal investigator Linda K. McEvoy, from UC San Diego Herbert Wertheim School of Public Health.

"If so, interventions that help reduce the cognitive effort required to understand speech -- such as the use of subtitles on television and movies, live captioning or speech-to-text apps, hearing aids, and visiting with people in quiet environments instead of noisy spaces -- could be important for protecting the brain and reduce the risk of dementia," McEvoy added.

Hearing Loss Symptom Evaluation
Hearing loss is a common problem that could occur in childhood or often develops with age or is caused by repeated exposure to loud noises. Keep abreast on its causes and symptoms.

For the analysis, 130 study participants underwent hearing threshold tests in research clinic visits between 2003 and 2005 and subsequently had MRI scans between 2014 and 2016.

The study results show that hearing impairment is associated with regionally specific brain changes that may occur due to sensory deprivation and the increased effort required to understand auditory processing stimulations.

Hearing Loss in Young Children and Early Intervention
Early identification of hearing loss in infants and young children and treating hearing impairment can go a long way to integrate them into the society of talking people.

"The findings emphasize the importance of protecting one's hearing by avoiding prolonged exposure to loud sounds, wearing hearing protection when using loud tools, and reducing the use of ototoxic medications," said co-author Emilie T. Reas, Assistant Professor at the UC San Diego School of Medicine.

Reference:

Elevated Pure Tone Thresholds Are Associated with Altered Microstructure in Cortical Areas Related to Auditory Processing and Attentional Allocation - (https://content.iospress.com/articles/journal-of-alzheimers-disease/jad230767)

Noise-Induced Hearing Loss
Noise-induced hearing loss is the hearing impairment that occurs due to noise exposure. Noise-related hearing loss is also listed among occupational illnesses.

Source-IANS