Hearing aid fitting: analysis of the impact on the auditory system during the first year of use in moderate and severe hearing loss.
Victor Goiris Calderaro, Maria Stella Arantes do Amaral, Eduardo Tanaka Massuda and 1 others
Hearing aids improved speech-in-quiet scores and reduced self-reported social and emotional restriction over 12 months, but the P300 brain response showed no measurable change.
The electrophysiological test did not detect the changes the behavioral tests did.
Key findings
1The P300 latency and amplitude showed no statistically significant difference between the pre-fitting stage and the post-fitting stages, for either tone-burst or speech stimuli.
2Sentence recognition in quiet improved from 79% before fitting to 85.4% and 86.6% at the two follow-up stages, a statistically significant difference (p = 0.0003).
3By the final stage, two participants moved from severe to no perceived restriction, two moved from severe to mild-to-moderate, and two moved from mild-to-moderate to no restriction.
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What it does not show
Only 24 participants, of whom just 6 had severe hearing loss, so subgroup comparisons are underpowered. No control group: everyone received hearing aids, so the improvement cannot be separated from maturation, practice, or expectation effects. Usage was self-reported (at least 8 hours/day); the authors note they did not use the hearing-aid datalog, so actual wear time is unverified. No formal auditory rehabilitation or therapy was provided during the study, so the gains reflect amplification alone. The P300 task required a finger-raise rather than mental counting, so memory demands were not assessed and the cognitive load was lower than in many P300 protocols. Single-centre, single-country sample (Brazil), with a predominantly middle-school education level.
Declared interests
The authors declare no financial support and no conflicts of interest.
The easy way to misread this
Do not read the null P300 result as evidence that hearing aids do not change central auditory processing. The authors themselves note the test may lack the sensitivity to detect subtle changes in postlingual hearing loss, and the behavioural and self-report measures showed clear improvement. Equally, do not read the speech-perception gain as definitive proof of central neuroplasticity, since the electrophysiological measure did not confirm it and there is no control group to rule out practice effects.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →