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Dr. Heather Hansen and colleagues at William & Mary, McGill University, and the University of Oklahoma identified patterns of communication between brain regions that were associated with misophonia symptom severity, but differed from those associated with anxiety, depression, and autistic traits. Their findings highlight the anterior insula, a brain region involved in attention, emotional processing, and awareness of bodily sensations, as an important area for understanding misophonia. The study also found that examining misophonia symptoms across a spectrum, rather than simply categorizing individuals as having or not having misophonia, revealed brain differences that otherwise went undetected.

To investigate these patterns, researchers analyzed existing functional magnetic resonance imaging (fMRI) data from 153 adults recruited from the general population. The scans were collected while participants rested without listening to sounds, allowing researchers to examine functional connectivity, or how different brain regions communicate with one another through coordinated activity.

Because these participants had not been directly assessed for misophonia, the researchers first developed a method to estimate misophonia symptom severity from questionnaires about sensory experiences. They developed this method using a separate dataset of 777 adults who had completed both sensory sensitivity and misophonia questionnaires.

Researchers found the following:

• Greater misophonia severity was associated with stronger communication between specific brain regions. These included the anterior insula, part of the salience network (a group of brain areas involved in identifying important information and directing attention), and regions involved in processing sounds, planning movements, and higher-level thinking.
• The brain patterns were specific to the anterior insula's role in the salience network. Researchers examined parts of the insula that are responsible for different aspects of human behavior, and found that the relationship with misophonia severity was only observed in the parts that are linked to detecting important information and directing attention.
• These patterns differed from those associated with anxiety, depression, and autistic traits. Although researchers identified insula-related changes in brain communication associated with anxiety, depression, and autistic traits, these patterns of brain communication were distinct from the pattern seen in misophonia.
• Examining misophonia along a spectrum revealed differences that otherwise went undetected. Researchers identified significant brain communication patterns when considering the full range of misophonia symptom severity. However, these patterns were not detected when participants were simply divided into groups with and without clinically significant misophonia symptoms.

Together, these findings help contribute to our growing understanding of the biological features of misophonia and how they may differ from other, often co-occurring, conditions. They also reinforce the importance of considering the full range of misophonia experiences when investigating its underlying brain mechanisms.

Importantly, the study relied on estimated misophonia severity rather than direct misophonia assessments, leaving room for future studies to further confirm these findings.

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Research Paper Title: Selective Disruption of Salience-Network Anterior Insula Connectivity in Misophonia: A Disorder-Specific Neural Signature

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Authors: Heather A. Hansen, Jordan E. Norris, Catherine M. Bain, Lauren E. Ethridge, and Christine L. Tardif

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ABOUT THE RESEARCH TEAM

Heather Hansen, PhD, is an Assistant Professor with the Department of Psychological Sciences at William & Mary, who completed this work as a postdoctoral fellow in the lab of Christine Tardif, PhD.