While the advantage of hearing aids over clearer conversations for daily communication has gained wide acceptance, newer research points to another potential advantage. A 2001 study demonstrated that older adults with hearing impairment experienced improvements in numerous cognitive function tests following placement of hearing aids.
The results, published in the Brazilian Journal of Otorhinolaryngology, indicate hearing aid intervention may have benefits other than just improvement of hearing. But, the researchers note that the study was too small and lacked a randomized control group so no conclusion can be reached as to whether the hearing aids were the direct cause of the cognitive gains.
The prospective study used 56 patients with hearing loss over the age of 60 who were given hearing aids. The subjects were given tests for cognition and mood before be given devices and at 6 month and 12 month intervals.
After six months, the mean Mini-Mental State Examination score had improved from 23.4 to 24.8. There was also improvement in performance on a clock-drawing test, where the mean score improved from 5.7 to 7.0. The investigators pointed out that improvements were more evident in those subjects who displayed some cognitive deterioration at baseline.
The differences for the group of participants who completed the 12-month follow-up were more striking. Their mean MMSE score increased from 25.6 to 28.2 and their verbal fluency mean increased from 11.0 to 14.3. Same gains were also made in clock-drawing level over the period.
The link between hearing and cognition has been increasingly studied. For instance, the extent of listening effort may increase in the presence of hearing loss making demands on attention and working memory. Everyday hearing may involve exhausted effort in distinguishing sound from noise.
Sound problems may also cause more difficult social encounters. As an individual who finds it difficult to follow speech starts to withdraw from social contact, they may because of this have fewer “brain and social-stimulation” type experiences.
Researchers are exploring whether boosting hearing could ease some of these pathways. The most recent research lends weight to the prospect, but does not validate a causal relationship.
While the new results were obtained, evidence about hearing aids and cognition is still inconclusive. The large ACHIEVE trial, a randomized clinical trial of 977 older adults, showed no difference in three-year global cognitive decline for those provided with hearing intervention vs those given health education.
A more recent 2026 analysis using Australian ASPREE data concluded that hearing aid prescription had no significant association with global cognitive measures over a seven-year follow-up period. The authors did still estimate a decreased risk of dementia in those with hearing aid prescriptions, but pointed out the limitations of the observational analysis.
While this adds to the growing body of evidence for an association between hearing remediation and cognitive improvement, it is not conclusive. What the TIL study offers is a modest amount of new evidence that hearing remediation may be linked to improvement on some cognitive assessment measures, but larger randomized controlled trials need to be conducted to conclusively show hearing loss treatment will prevent or delay cognitive decline.
