Misophonia: Why Sounds Like Chewing Trigger Intense Reactions

For some, the sound of chewing, slurping, or a pen clicking triggers more than mere annoyance; it elicits an intense, immediate reaction that precedes any conscious decision to become angry. Science has a name for this phenomenon: misophonia.

Over the past decade, a growing body of neuroimaging studies, prevalence surveys, and clinical trials has begun to document this condition with data, although it still lacks an official diagnostic code. The most cited study, published in 2017 by Sukhbinder Kumar and his team from Newcastle University and University College London, scanned the brains of 20 adults with misophonic reactions and 22 without. When listening to trigger sounds, general unpleasant sounds, and neutral sounds, the misophonia group showed significantly greater activity in the anterior insula, a region linked to detecting relevant stimuli, along with marked increases in heart rate and skin conductance.

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In the first group, trigger sounds generated much greater activity in the anterior insula, a region linked to the detection of relevant stimuli, in addition to a more marked increase in heart rate and skin conductance.

Subsequent research has identified similar patterns. A 2019 study from Amsterdam found greater activity in the insula and anterior cingulate cortex in patients. A broader analysis in 2026 examined MRIs of 162 adults, finding that insula connectivity correlated with misophonia scores, independent of anxiety, depression, or autistic traits. However, researchers caution that these studies use small sample sizes, and no brain scan can yet definitively diagnose the condition in an individual.

Alternative hypotheses suggest the irritation may stem from a connection between auditory and visual areas and the ventral premotor cortex, which controls mouth and facial movements. In this view, the sound acts as a trigger rather than the direct cause of the reaction, a theory still under debate in cognitive neuroscience. Despite these advances, misophonia is not yet listed in major diagnostic manuals like the DSM-5 or ICD-11, and proposed classifications, such as being part of the obsessive-compulsive spectrum, have not achieved consensus.

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The irritation does not depend so much on the sound itself as on a connection between the auditory and visual areas and the ventral premotor cortex, the area that controls mouth and facial movements.