Age and Tinnitus: Auditory Profile Differences

Tinnitus can occur even when a standard hearing test comes back normal. A new study from researchers Pauline Devolder, Hannah Keppler, and I. Dhooge challenges the common assumption that “hidden hearing loss” is the sole culprit in these cases. Their work reveals that tinnitus interacts with age to create two distinct auditory profiles: one of neural enhancement in youth and one of declining function in mid-life.

## Study Design: Matching for Age and Hearing to Isolate Tinnitus Effects
To separate the effects of tinnitus from those of age and hearing loss, the researchers designed a tightly controlled experiment. They recruited 113 participants, dividing them into groups with and without tinnitus. Crucially, these groups were precisely matched for age and hearing status, meaning any differences in test results could more reliably be attributed to the presence of tinnitus.

Each participant underwent a battery of tests. These included otoacoustic emissions (measuring outer hair cell function), auditory evoked potentials (measuring neural signaling from the brainstem and midbrain), and assessments of the middle ear muscle reflex. The team also administered behavioral tasks to evaluate speech perception, including vowel discrimination and understanding speech in noisy environments. This multi-method approach allowed them to evaluate the entire auditory pathway from the ear to the brain.

## Opposite Effects in Young Versus Middle-Aged Adults with Tinnitus
The most striking findings were the age-dependent contrasts. Young adults with tinnitus and normal audiograms showed signs of a hyper-responsive auditory system. Their auditory brainstem responses were enhanced, and their envelope following responses—a measure of the brain’s ability to track the rhythm of sound—were elevated. Behaviorally, they outperformed their tinnitus-free peers in vowel discrimination tasks.

The pattern completely reversed for middle-aged adults with tinnitus. This group showed no neural enhancements. Instead, they demonstrated poorer performance on speech-in-noise tests. Their results suggest a system struggling to process complex auditory information in challenging listening situations.

## A Shift from Peripheral to Central Auditory Processing
Correlation analyses provided a potential mechanism for these findings. In control participants without tinnitus, auditory function was largely tied to peripheral measures like otoacoustic emissions. For those with tinnitus, the strongest correlations were with central auditory processing measures, like the envelope following response.

This indicates a tinnitus-related reorganization. The auditory system may become less reliant on the cochlea’s input and more dependent on central brain pathways. This shift could be the brain’s attempt to compensate for a subtle peripheral deficit or, in the case of young adults, an overcompensation that leads to hyper-acuity and, ultimately, the perception of phantom sound. This aligns with other research exploring distinct tinnitus phenotypes related to brain connectivity.

## Hyperacusis Linked to Reflex, Not Tinnitus
An important secondary finding clarified the relationship between tinnitus and hyperacusis, a heightened sensitivity to everyday sounds. The study found that the strength of the middle ear muscle reflex—an involuntary contraction that dampens loud sounds—was not associated with tinnitus. It was, however, correlated with hyperacusis-related parameters. This supports the idea that while tinnitus and hyperacusis often co-occur, they may stem from different physiological mechanisms.

## Implications for Diagnosis and Future Research
These results have direct implications for how clinicians and researchers understand tinnitus. “The study reveals distinct tinnitus-related auditory profiles throughout the lifespan,” the authors state. A one-size-fits-all model is insufficient. A young adult with normal hearing and acute tinnitus represents a fundamentally different physiological state than a middle-aged adult with the same complaint.

This work provides objective markers that could improve diagnosis and treatment targeting. For instance, a treatment designed to calm a hyper-responsive brainstem in a young adult may be ineffective or even harmful for a middle-aged person whose system is already showing signs of degradation. Understanding a patient’s specific auditory profile, guided by research like this, will be essential for personalized care.

Furthermore, the study underscores the powerful influence of age on all auditory processing, a theme explored in related articles on how age shapes tinnitus auditory profiles. It also demonstrates that normal audiometric thresholds do not guarantee a fully healthy auditory system, highlighting the need for more sensitive diagnostic tools, such as those investigated in remote audiometry validation studies.

**Source:** Devolder P, Keppler H, Dhooge I. *Disentangling tinnitus, age, and hearing status effects on sensorineural encoding and speech perception.* [DOI: 10.64898/2026.06.02.729537](https://doi.org/10.64898/2026.06.02.729537)