Brain Responses to Sounds in Misophonia vs. Hyperacusis

Distinct Brain Networks Underlie Misophonia and Hyperacusis

A new fMRI study from the University of Illinois Urbana-Champaign has identified clear differences in how the brains of people with misophonia and hyperacusis process emotionally charged sounds. The research, led by Namitha Jain and Fatima Husain, provides the strongest neuroimaging evidence to date that these often-confused conditions have separate neural foundations.

The team recruited 91 young adults and categorized them into four groups: those with misophonia, those with hyperacusis, those with both conditions (comorbid), and controls without sound sensitivity.

Methodology: Listening and Rating Sounds in the Scanner

During a task-based fMRI scan, participants listened to 90 sounds from the International Affective Digitized Sounds-2 database. These sounds ranged from pleasant to unpleasant and neutral. While hearing the sounds, participants continuously rated how positive or negative each sound felt. The researchers then analyzed whole-brain activation patterns and the functional connectivity between specific brain networks.

This method allowed them to observe not just which areas were active, but how different brain regions communicated during the experience of sound.

Misophonia: Visual Brain Areas Are Hyperactive

The findings for misophonia were unexpected. Individuals with misophonia, regardless of whether they also had hyperacusis, showed heightened activation in visual association areas of the brain when processing unpleasant versus neutral sounds. They also exhibited reduced connectivity between the salience network—which flags important stimuli—and visual networks.

“This suggests atypical cross-modal sensory involvement,” the authors write. In misophonia, a condition typically triggered by specific pattern-based sounds like chewing or tapping, the brain may be improperly engaging visual processing regions during auditory annoyance. This could relate to the strong, often visual, mental imagery that accompanies misophonic triggers.

Hyperacusis: Impaired Top-Down Control from the Frontal Cortex

The hyperacusis group presented a different neural signature. Their primary issue appeared to be connectivity, not hyperactivity. Compared to both controls and the misophonia group, people with hyperacusis showed reduced connectivity between hubs of the salience network and frontal control regions.

This indicates impaired top-down regulation. In hyperacusis, a condition defined by hypersensitivity to sound volume, the brain’s executive control centers may fail to properly modulate the alarm signals generated by the salience network. The frontal cortex cannot effectively “dial down” the reaction to loudness. Interestingly, this regulatory connectivity was preserved in the misophonia group for generally unpleasant sounds, pointing to a fundamental difference.

This finding aligns with previous research exploring hyperacusis brain changes observed in MRI studies.

The Comorbid Group Shows a Combined Neural Profile

Participants who had both misophonia and hyperacusis displayed neural patterns associated with each disorder. This supports the clinical observation that the conditions can coexist, each contributing its own distinct neural and perceptual challenge to the individual’s experience.

Practical Implications for Diagnosis and Treatment

These neural distinctions have direct practical implications. Clinically, misophonia and hyperacusis are often conflated because both involve negative reactions to sound. This study confirms they are different at a brain systems level.

“Disentangling their neural bases is essential for improving diagnosis and treatments,” the authors state. Accurate diagnosis is the first step toward effective management.

Toward Targeted Interventions

The different neural profiles suggest interventions should be tailored. For hyperacusis, where top-down frontal regulation is weak, therapies aimed at strengthening cognitive control over auditory reactions could be beneficial. This might include certain forms of cognitive training or neuromodulation.

For misophonia, where cross-modal visual-auditory interactions are atypical, treatments might incorporate techniques that address this sensory blending. The involvement of visual networks also raises questions about whether existing tDCS protocols for tinnitus and hyperacusis pathways would need adjustment to be effective for misophonia.

The study also reinforces the idea that sound sensitivity disorders are brain-based, not just ear-based. This shifts the focus of treatment toward central nervous system approaches. Future research combining this neural data with behavioral measures will be key for refining mechanistic models.

Understanding these separate pathways is a significant step. It moves beyond symptom description to a level where biology can guide therapy, much like ongoing work to reverse noise-induced amygdala plasticity in hearing loss.

The full research paper, “Differential brain responses to affective sounds in misophonia and hyperacusis: A task-based fMRI approach,” is available online ahead of print in Cognitive, Affective, & Behavioral Neuroscience. You can access it via its DOI: 10.3758/s13415-026-01435-z or PMID: 41981382.