Misophonia vs Hyperacusis: Brain Responses to Sounds

Distinct Brain Networks Underlie Misophonia and Hyperacusis

Functional MRI scans from 91 young adults have revealed separate neural signatures for misophonia and hyperacusis. The study, led by Namitha Jain and Fatima Husain at the University of Illinois Urbana-Champaign, provides some of the clearest evidence yet that while these sound tolerance disorders share symptoms, they involve different brain pathways. This neural distinction is a significant step toward moving beyond subjective symptom reports and developing disorder-specific treatments.

Humans are wired to react strongly to emotional sounds like a baby’s cry or a sudden scream. In misophonia and hyperacusis, this system malfunctions. Misophonia triggers intense anger or disgust from specific, often human-made, sounds like chewing. Hyperacusis involves physical pain or discomfort from sounds that are simply too loud for the individual, like a running faucet. Because patients can have both conditions, untangling their biology has been difficult.

Listening to Emotion in the MRI Scanner

The research team categorized participants into four groups: misophonia only, hyperacusis only, comorbid (both), and controls with no sound sensitivity. Inside the fMRI scanner, each person listened to 90 emotionally valenced sounds from a standardized database, ranging from pleasant (laughter) and unpleasant (screams) to neutral tones. As they heard each sound, participants rated how pleasant or unpleasant it felt.

This task-based approach allowed researchers to observe brain activation and communication between regions in real-time as emotional sounds were processed. They focused on whole-brain activity and specific functional connectivity—how well different neural networks talk to each other.

Misophonia: When Sounds Activate the Visual Brain

The findings for misophonia were unexpected. Compared to controls, individuals with misophonia (including those with comorbid hyperacusis) showed hyperactivation in visual association areas of the brain when processing unpleasant versus neutral sounds. They also had reduced connectivity between the brain’s salience network—which flags important stimuli—and these visual regions.

“This suggests atypical cross-modal sensory involvement,” the authors report. In simpler terms, for someone with misophonia, a triggering sound may abnormally recruit brain areas involved in vision. This could relate to the strong visual context often associated with triggers (seeing someone eat) or the intrusive, vivid nature of the reaction itself. This cross-talk between senses might be a core feature of misophonia, differentiating it from other auditory disorders. For more on the brain’s response in these conditions, see our article “Misophonia vs Hyperacusis: Brain Responses Explained”.

Hyperacusis: A Failure of Top-Down Control

The neural pattern for hyperacusis was different. This group showed notably reduced connectivity between hubs of the salience network and frontal control regions in the prefrontal cortex. “This indicates impaired top-down regulation,” the paper states.

The frontal cortex is responsible for executive control, modulating emotional and sensory responses. If its connection to the salience network is weak, the brain may struggle to downgrade the importance of a loud but harmless sound. This “broken brake” system could explain the perceived overwhelming intensity and aversive reaction in hyperacusis. Notably, this connectivity was preserved in the misophonia-only group for generally unpleasant sounds, suggesting their top-down regulation for non-specific triggers is intact. This key difference in frontal lobe engagement is further explored in our “Hyperacusis: Brain MRI Review on Hearing Health”.

Comorbid Group Shows a Combined Neural Pattern

Participants who had both misophonia and hyperacusis presented a neural profile that incorporated features of each disorder. This supports the clinical observation that the conditions frequently co-occur but are not the same. Their brains exhibited signs of both the atypical visual-sensory processing seen in misophonia and the weakened fronto-salience connectivity characteristic of hyperacusis.

“Overall, these findings reveal overlapping and disorder-specific neural patterns across sound tolerance profiles,” the team concludes. The study confirms that comorbidity is a true mix of two distinct physiological contributors, not a single, more severe version of one disorder.

Toward Better Diagnosis and Targeted Interventions

The practical implications of this work are direct. First, it provides objective neural markers that could aid in differentiating misophonia from hyperacusis, leading to more accurate diagnoses. Second, it points treatment research toward different targets.

For misophonia, therapies might benefit from addressing the unusual sensory integration between auditory and visual brain areas. Techniques that alter the multisensory context of a trigger could be investigated. For hyperacusis, the goal may be to strengthen top-down regulatory pathways, possibly through cognitive therapies or neuromodulation techniques designed to enhance frontal lobe control over auditory processing. The pursuit of such targeted brain-based interventions aligns with research into “Deep Brain Stimulation May Treat Tinnitus” for other hearing-related disorders.

Fatima Husain and colleagues state that future research should combine this type of neural data with detailed behavioral measures to build precise mechanistic models. These models are essential for moving from symptom management to treatments that address the root cause in the brain.

Source: This article is based on the study “Differential brain responses to affective sounds in misophonia and hyperacusis: A task-based fMRI approach” by Jain N, Ajmera S, et al. (Cogn Affect Behav Neurosci. 2026). DOI: 10.3758/s13415-026-01435-z. PMID: 41981382.