Brain Responses to Sounds in Misophonia vs. Hyperacusis

For people with misophonia, the sound of someone chewing can trigger rage or panic. For those with hyperacusis, the volume of a passing car can feel physically painful. While both are sound tolerance disorders, new brain imaging research shows they are processed very differently in the brain. A team led by Namitha Jain and Fatima Husain at the University of Illinois Urbana-Champaign has identified distinct neural signatures for each condition, even when they co-occur. Their work, published in Cognitive, Affective, & Behavioral Neuroscience, moves us closer to biologically-based definitions and treatments.

Method: Mapping Brain Responses to Emotional Sounds

Jain and colleagues recruited 91 young adults and categorized them into four groups: those with misophonia, those with hyperacusis, those with both conditions (comorbid), and controls with no sound sensitivity issues. Inside a functional magnetic resonance imaging (fMRI) scanner, participants listened to 90 emotionally charged sounds from a standardized database. The sounds ranged from pleasant (like laughter) and neutral to unpleasant (like screams or vomiting). As they listened, participants rated how pleasant or unpleasant each sound was.

The researchers then analyzed two key elements: which brain areas became more active during unpleasant versus neutral sounds, and how different brain networks communicated with each other during this process. They paid particular attention to the salience network, a system that flags important stimuli, and its interaction with regions involved in visual processing and frontal control.

Finding 1: Misophonia Involves Cross-Modal Brain Overactivity

The brain scans revealed a pattern specific to misophonia. Individuals with misophonia, including those who also had hyperacusis, showed heightened activation in visual association areas when hearing unpleasant sounds. Even more telling was the connectivity analysis. In the misophonia groups, the connection between the salience network and the visual network was weaker compared to controls.

“This suggests atypical cross-modal sensory involvement,” the authors write. In simpler terms, the brains of people with misophonia may be trying to “see” the source of a triggering sound in an exaggerated way, while the normal gating mechanism between the auditory salience system and the visual system is not working properly. This could explain why seeing the action that makes a sound (like someone tapping a pen) often intensifies the misophonic reaction. It is not just an auditory problem; it’s a multisensory one.

Finding 2: Hyperacusis Shows a Breakdown in Top-Down Control

The neural signature for hyperacusis was different. This group did not show the same visual area overactivity. Instead, they exhibited significantly reduced connectivity between hubs of the salience network and regions in the frontal cortex responsible for top-down control and regulation.

This finding points to a core mechanism in hyperacusis: an impaired ability for the brain’s higher-order control centers to dampen the alarm signals generated by loud or intense sounds. The salience network flags the sound as threatening, but the frontal regions fail to effectively step in and reduce the emotional and physiological response. Notably, this connectivity was preserved in the misophonia-only group for generally unpleasant sounds, indicating their regulatory circuitry is intact for non-specific triggers.

Finding 3: The Comorbid Brain Shows a Combined Pattern

Participants diagnosed with both misophonia and hyperacusis displayed neural patterns associated with each disorder. Their brains showed the cross-modal visual activity typical of misophonia and the impaired salience-frontal connectivity characteristic of hyperacusis. This provides a neural explanation for why the comorbid experience is often more severe and complex, blending the specific trigger reactivity of misophonia with the generalized loudness intolerance of hyperacusis.

The study confirms that while these disorders frequently overlap clinically, they stem from separable neural dysfunctions. This is a critical step away from viewing them as vague “sound sensitivity” and toward precise biological definitions.

Practical Implications for Diagnosis and Treatment

These distinct neural maps have direct implications. For diagnosis, they suggest that behavioral assessments could be refined to probe these specific differences—such as the role of visual cues in misophonia versus the role of sound intensity and emotional regulation in hyperacusis. Neuromodulation therapies, like 40 Hz light therapy for hearing and brain health, might one day be tailored to target the visual cortex in misophonia or frontal networks in hyperacusis.

The findings also support different therapeutic approaches. For misophonia, treatments that address the maladaptive cross-modal association between sight and sound may be beneficial. For hyperacusis, interventions should likely focus on strengthening top-down cognitive control and emotional regulation circuits. Cognitive behavioral therapy could be adapted to target these specific networks. Furthermore, as research into AI music therapy advances in hearing health research, such tools could generate sound exposure protocols personalized to a patient’s specific neural profile.

This work builds on prior studies, such as earlier misophonia vs hyperacusis fMRI research, by using a larger sample and directly comparing pure and comorbid groups. It provides a clearer picture of the brain’s sound processing errors.

Source: Jain N, Ajmera S, Shahsavarani S, et al. Differential brain responses to affective sounds in misophonia and hyperacusis: A task-based fMRI approach. Cogn Affect Behav Neurosci (2026). doi: 10.3758/s13415-026-01435-z. PMID: 41981382.