When the Brain Cannot Stop Listening

A Bioenergetic Perspective on Chronic Tinnitus:

From auditory stress and allostatic triage to compensatory brain networks, incomplete recovery, and biological hysteresis

Tinnitus is often described as hearing a sound that does not exist in the external environment—a ringing, buzzing, or humming that can persist even in silence.

But why does a temporary auditory disturbance sometimes become a chronic experience? And why does the brain continue responding to a signal that serves no obvious purpose?

A new study published in iScience by Meng-Fang Gong and colleagues (2026) offers an intriguing clue. Their findings suggest that acute and chronic tinnitus involve different patterns of brain network activity. In the acute stage, networks responsible for detecting important signals become unusually dominant. In chronic tinnitus, the brain appears to partially restore its regulatory balance—but through a different, potentially more rigid network organization.

This raises a deeper possibility: What if chronic tinnitus reflects not simply an auditory problem, but a nervous system that has adapted to a disturbance without fully recovering from it?

Two emerging perspectives—Kelley's Allostatic Triage Model of Psychopathology and our bioenergetic impedance framework—may help explain how such a transition could occur.

What the new study discovered

Gong and colleagues investigated 45 individuals: 15 with acute tinnitus lasting less than six months, 15 with chronic tinnitus lasting six months or longer, and 15 healthy controls.

Importantly, all participants had clinically normal conventional hearing thresholds. This allowed the researchers to investigate brain network differences without the major confounding influence of overt hearing loss, although more subtle auditory injuries could not be excluded.

Using electroencephalography (EEG), the researchers examined rapid changes in brain activity through two complementary techniques: EEG microstate analysis and dynamic functional connectivity analysis.

Rather than looking only at average brain activity, they investigated how networks repeatedly activate, interact, and transition between functional states.

Their findings revealed two distinct patterns.

Acute tinnitus: The brain gives too much priority to the signal

In acute tinnitus, the researchers observed increased engagement of the salience network, which helps the brain detect and prioritize potentially important information.

At the same time, engagement of the central executive network, associated with cognitive control and attention regulation, was reduced.

The salience-related EEG microstate occupied approximately 35% of recording time in acute tinnitus, compared with 29% in healthy controls. Conversely, executive-related microstate coverage decreased from approximately 31% in controls to 21% in acute tinnitus.

The researchers also found unusually strong gamma-frequency synchronization within the executive-related network.

Together, these findings suggest a brain state in which the tinnitus signal repeatedly captures attention while regulatory network coordination becomes altered.

The brain behaves as though something requires continued monitoring.

This does not necessarily mean that the individual consciously perceives the sound as dangerous. Rather, the nervous system may be assigning excessive processing priority to an internally generated sensory signal.

Chronic tinnitus: The brain reorganizes rather than simply deteriorates

The chronic findings were even more interesting.

Compared with acute tinnitus, individuals with chronic tinnitus showed more balanced transitions between salience-related and executive-related networks. Some of these transitions became statistically comparable to those of healthy individuals.

At first glance, this might suggest recovery.

However, the researchers also observed greater low-frequency network efficiency, particularly involving delta- and beta-frequency activity, alongside increased regularity of EEG microstate patterns.

One measure, called global explained variance, increased from 65.7% in healthy controls to 69.5% in acute tinnitus and 74.3% in chronic tinnitus.

This suggests that chronic tinnitus involves brain activity increasingly organized around recurring patterns.

The authors interpret these changes as compensatory network rebalancing, potentially accompanied by greater rigidity or stabilization of maladaptive organization.

The striking implication is that some regulatory functions may become more balanced even though the brain has not returned to its original network configuration—and tinnitus persists.

This is where the concept of biological recovery becomes especially relevant.

Allostatic triage: Why the brain prioritizes some functions over others

In 2025, D. Parker Kelley and colleagues introduced the Allostatic Triage Model of Psychopathology in Neuroscience & Biobehavioral Reviews.

Their central argument is that the brain does not possess unlimited energetic resources.

Every neural process—from sensory perception and threat detection to attention, memory, and behavioral regulation—requires energy. When stress increases demand, the brain must coordinate how resources are allocated among competing activities.

Kelley and colleagues call this process allostatic triage.

Under stressful conditions, the nervous system may prioritize functions that appear immediately important while reducing resources available for other activities.

This offers an interesting interpretation of acute tinnitus.

An unexpected auditory sensation presents the brain with a signal that may require attention. Detecting and evaluating that signal can take priority over other processes.

If the signal persists, the nervous system may continue allocating attention and regulatory effort toward it.

From this perspective, heightened salience network engagement is not necessarily an arbitrary malfunction. It may represent an adaptive prioritization process that has become disproportionate or difficult to terminate.

Importantly, Kelley's model does not establish that energetic scarcity causes tinnitus. Instead, it suggests how energetic availability and stress-related resource allocation could influence the brain's response to persistent sensory disturbances.

Bioenergetic impedance: Why adaptation may remain unresolved

Allostatic triage helps explain which neural activities receive priority.

But another question remains: Why might the nervous system struggle to disengage from its stress response and restore its previous functional organization?

Our bioenergetic impedance framework approaches this question through the relationship between energetic demand, throughput, and recovery.

Bioenergetic impedance can be understood as a time-dependent constraint on the ability of biological systems to mobilize, transport, transform, and utilize energy effectively relative to demand.

This is not simply a matter of having enough glucose, oxygen, or other energetic substrates.

The critical issue is whether those resources can be converted into usable energy and delivered to the biological processes that need them, at the rate required.

A system may have adequate substrate availability while still experiencing limitations in mitochondrial activity, metabolic flux, cellular transport, or network coordination.

When demand repeatedly exceeds effective throughput, the system must compensate.

Some activities may be prioritized. Others may be reduced, delayed, or reorganized.

And when recovery remains incomplete, these compensatory changes may persist.

Applying this perspective to acute tinnitus

Imagine two individuals experiencing comparable abnormal auditory signals.

One nervous system may have sufficient energetic and regulatory capacity to process the disturbance, reduce its significance, and progressively disengage from the response.

Another may face greater constraints arising from ongoing stress, impaired sleep, metabolic disturbances, inflammation, or other conditions affecting physiological recovery.

Under those circumstances, continued monitoring and regulation of the auditory signal might be more difficult to resolve.

Allostatic triage could increase the relative priority of salience-related processing, while bioenergetic impedance could constrain the system's ability to restore its previous functional balance.

In this hypothetical model, acute tinnitus involves more than heightened auditory activity.

It represents an interaction among sensory disturbance, stress-related resource prioritization, and the capacity to recover from the resulting neural demands.

Gong's EEG findings are compatible with parts of this interpretation, but they do not directly establish bioenergetic impairment. The proposed relationship remains to be tested.

From persistent adaptation to a new operating configuration

If the auditory disturbance continues, the brain cannot necessarily sustain the same acute response indefinitely.

It may reorganize.

That is consistent with the changes Gong and colleagues observed in chronic tinnitus.

Some network transitions become more balanced, while alternative oscillatory patterns appear to support functional coordination.

Rather than remaining in a state of continuous acute salience dominance, the nervous system may establish a different operating configuration.

This is potentially useful. Compensation may reduce the disruptive impact of the auditory signal and support ongoing cognitive and behavioral activities.

But compensation should not be confused with recovery.

Compensation allows a system to continue functioning under altered conditions. Recovery involves the capacity to resolve the adaptive response and restore appropriate flexibility or prior function.

A chronic tinnitus network may therefore appear more balanced than an acute tinnitus network without being physiologically equivalent to a healthy network.

The brain may have become better at functioning with the disturbance rather than returning to the state that existed before it.

Canalization: When repeated adaptation becomes embedded

Kelley's framework also introduces the importance of activity-dependent neural plasticity.

When particular networks and pathways are repeatedly activated, their organization can become progressively reinforced.

This process relates to canalization—the stabilization of biological activity into increasingly preferred patterns.

In chronic tinnitus, repeated sensory processing, salience attribution, and regulatory compensation could gradually reinforce alternative neural configurations.

Several mechanisms may contribute, including altered synaptic connectivity, inhibitory regulation, persistent network feedback, and changes in gene expression.

One possible contributor deserves particular attention: metabolic–epigenetic remodeling.

Cellular metabolism does more than supply energy. Metabolic intermediates and cofactors help regulate enzymes controlling DNA methylation, histone modifications, and transcriptional activity.

If energetic throughput becomes constrained, metabolic intermediates may accumulate, become depleted, or be redirected toward alternative pathways.

We describe this as metabolic congestion and rerouting.

These changes could modify the biochemical environment in which epigenetic regulation occurs. Over time, altered gene expression might reinforce the compensatory cellular and neural configurations established during persistent stress.

This offers a possible molecular connection between unresolved bioenergetic impedance and long-lasting network adaptation.

However, this is a proposed mechanism, not a finding of Gong's tinnitus study. The researchers did not measure mitochondrial function, metabolic flux, or epigenetic remodeling.

Hysteresis: When the brain carries the history of its disturbance

Another concept helps clarify why persistent adaptation may be difficult to reverse: hysteresis.

In biology, hysteresis describes a situation in which the current state or response of a system depends partly on its history.

A system exposed to prolonged stress may not immediately return to its original configuration when the stressor diminishes.

The adaptations developed during that exposure can influence subsequent behavior.

Consider how a path becomes established through repeated use. Even after the original reason for taking that path disappears, the route may remain easier to follow than alternative ones.

Biological networks can exhibit analogous history-dependent behavior.

For chronic tinnitus, the hypothesis is that repeated allostatic prioritization and compensatory network activity may progressively stabilize a configuration that persists beyond the conditions that originally promoted it.

Metabolic and epigenetic remodeling could further reinforce this persistence.

This would provide a possible explanation for why resolving an initiating disturbance does not always produce immediate restoration of normal sensory processing.

Yet an important scientific distinction remains: persistent tinnitus does not, by itself, prove hysteresis. The initiating auditory disturbance may still be present, including forms of cochlear injury undetected by conventional hearing tests.

To demonstrate hysteresis, researchers would need to show that network responses remain altered after the relevant initiating conditions have changed, and that the resulting trajectory depends on previous exposure.

Nevertheless, Gong's findings make this hypothesis worth investigating.

A bioenergetic model of tinnitus progression

Bringing these perspectives together suggests a possible progression:

1. Auditory disturbance: Abnormal peripheral or central auditory signaling creates additional sensory and regulatory demand.

2. Allostatic triage: The nervous system increases the relative priority of salience-related processing, potentially reducing engagement of competing regulatory activities.

3. Bioenergetic constraint: Where effective energetic throughput or recovery capacity is limited, sustained regulation of the disturbance may become increasingly difficult.

4. Compensatory reorganization: The brain adjusts functional connectivity and oscillatory coordination to maintain essential activities in the presence of persistent auditory input.

5. Canalization: Repeated neural activity, potentially reinforced by metabolic and epigenetic remodeling, may stabilize the alternative network configuration.

6. Incomplete recovery and possible hysteresis: Some functional relationships partially normalize, but the nervous system may remain organized differently from its earlier state.

This sequence is a mechanistic hypothesis, not a demonstrated progression in the 45 participants studied by Gong and colleagues. Their study compared different individuals at different stages rather than tracking the same individuals over time.

Still, it provides a framework for asking questions that conventional tinnitus models may not fully address.

The missing question: Can the brain recover?

Most studies of tinnitus focus on auditory signaling, cortical excitability, attention, emotional processing, or neural connectivity.

These are important.

But the bioenergetic perspective introduces another dimension:

How much physiological capacity is required to sustain the response, and how effectively can the nervous system recover afterward?

Two individuals might experience comparable tinnitus intensity yet differ substantially in their ability to disengage attention, restore network activity after a challenge, or tolerate repeated sensory demands.

Similarly, apparently normal resting-state network activity may conceal reduced flexibility or delayed recovery.

Future studies could investigate this using repeated EEG measurements during and after standardized auditory or cognitive challenges.

Researchers could measure how rapidly salience and executive networks return toward their individual baselines, whether repeated challenges produce residual network displacement, and whether these recovery patterns predict chronic tinnitus.

Combining such measurements with appropriately validated markers of mitochondrial function, cerebral metabolism, and physiological recovery could help determine whether bioenergetic constraints contribute to tinnitus persistence.

Longitudinal measurements would also help distinguish individuals whose tinnitus resolves, those who successfully habituate while symptoms remain, and those who develop persistent distress.

These groups may follow different recovery trajectories despite sharing an initial auditory symptom.

A broader lesson from tinnitus

Chronic tinnitus may offer a useful example of a much wider biological principle.

The nervous system constantly adapts to disturbances. Most adaptations are necessary and beneficial.

The difficulty may arise when adaptive responses cannot be fully resolved.

A biological system can maintain important functions by redistributing resources, changing network connectivity, or establishing alternative operating states.

Over time, those compensations may become increasingly stable.

The result can be a system that continues to function but has not necessarily recovered its original organization, flexibility, or capacity to respond to future challenges.

Similar possibilities warrant investigation in chronic pain, migraine, persistent fatigue, and other conditions involving prolonged sensory, immune, or stress-related responses.

Gong and colleagues have shown that the brain networks associated with chronic tinnitus differ from those associated with acute tinnitus, even when some aspects of network balance appear restored.

Kelley's allostatic triage model offers a possible explanation for how stress changes the priority assigned to different brain functions.

Our bioenergetic impedance perspective adds the question of what limits the throughput and recovery capacity needed to sustain and reverse those adaptations.

Together, these approaches suggest a different way of thinking about chronic neurological conditions.

The brain may learn to live with a disturbance without fully recovering from it.

Understanding that distinction could shift future research from studying abnormal activity alone toward measuring the costs of adaptation, the persistence of compensatory networks, and the biological capacity for recovery.

Because ultimately, successful adaptation and successful recovery are not always the same thing.

References

Gong, M.-F., Tao, S.-Y., Dai, B., Ding, Z.-L., He, Q., Dai, Y.-K., Liu, J.-S., & Tao, D.-D. (2026). EEG microstates and dynamic functional connectivity reveal stage-specific brain networks in subjective tinnitus. iScience, 29(8), 116995. https://doi.org/10.1016/j.isci.2026.116995

Kelley, D. P., Singleton, S. P., Venable, K., Sturm, G., Skovgaard, A., Francis, J., Neylan, T. C., Bradley, E. R., Woolley, J., Picard, M., & O'Donovan, A. (2025). The allostatic triage model of psychopathology (ATP Model): How reallocation of brain energetic resources under stress elicits psychiatric symptoms. Neuroscience & Biobehavioral Reviews, 179, 106419. https://doi.org/10.1016/j.neubiorev.2025.106419

Tippairote T and Hoonkaew P (2026) Bioenergetic impedance: a network physiology framework for stress adaptation, maladaptation, and recovery. Front. Netw. Physiol. 6:1967461. https://doi.org/10.3389/fnetp.2026.1967461