State of the Science: Disgust and the Anxiety Disorders

Anxiety disorders have long been conceptualized as disorders of fear, while other emotions have largely been overlooked. However, an emerging literature has increasingly implicated disgust in certain anxiety-related disorders, including obsessive-compulsive disorder, specific phobias (e.g., spider phobia), health anxiety, and posttraumatic stress disorder. Roughly two decades of research has accumulated evidence identifying various mechanisms linking disgust-related phenomena to these disorders. In the present "State of the Science" review, we sought to summarize the current state of the literature with respect to disgust-related mechanisms in anxiety disorders, including trait-level vulnerabilities (e.g., disgust proneness), cognitive processes (e.g., biases of attention and memory), and associated learning mechanisms (e.g., evaluative conditioning). Research in these areas has revealed important ways in which disgust differs from fear-related phenomena, which have important treatment implications. From there, we sought to summarize research on laboratory interventions that attempt to target and attenuate disgust, as well as the early research on formal cognitive-behavioral treatments that integrate disgust-related interventions for anxiety disorders. Although the past two decades of research have revealed important insights related to the role of disgust in psychopathology, much remains to be learned in this area. We propose some future directions, emphasizing the importance of a guiding framework that highlights studying disgust-related mechanisms across different levels of analysis.