Somatic Symptom Perception and Interoception A Latent-Variable Approach

Models of chronic somatic symptoms assume that abnormalities in interoception are related to the development and maintenance of symptom distress. Different models, however, disagree on the exact nature of the assumed abnormality: cognitive-behavioral models stress a hypervigilant cognitive style (predicting higher interoceptive accuracy) whereas predictive processing models assume a less detailed sensory processing (predicting lower interoceptive accuracy). This study aimed at testing the relationship between interoception and symptom perception. Using structural equation modeling, associations between cardiac interoception and symptom perception were tested in a sample of students (n = 316) and a second heterogeneous sample (n = 340, including 63 patients with either pathological health anxiety or a somatoform disorder according to DSM-IV). Stronger sensory symptom perceptions in the cardiorespiratory system were associated with lower interoceptive accuracy in sample 2. The findings are more in line with the predictive processing approach, suggesting less detailed and more biased interoception being associated with chronic somatic symptom distress.