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Research has identified the neural response to errors (the error-related negativity; ERN) as a marker of current anxiety, as well as risk for future anxiety. Previous work found that traditional cognitive behavioral therapy approaches do not impact the ERN. However, none of these approaches directly target the psychological constructs linked to an increased ERN (e.g., error sensitivity). In the current study, we examine the extent to which a brief, computerized intervention (“Treating the ERN”; i.e., TERN) might impact the ERN by reducing error sensitivity. Results suggest that TERN reduced the ERN and that the impact of the intervention was larger amongst individuals with an increased baseline ERN. This study is an important first step in the development of a novel intervention approach that directly targets error sensitivity, and thereby the ERN.