Exploring the interplay between interoception and dissociative experiences: insights from a non-clinical population.

Alterations in interoception have been implicated in several neurological and psychiatric conditions, including those involving dissociative tendencies. Thus, investigating the link between interoception and dissociation may shed light on the mechanisms supporting self-consciousness and its disturbances. Here, we investigated whether reduced interoception was associated with trait and experimentally induced dissociative experiences in healthy participants varying in their levels of dissociation. We measured participants’ interoceptive accuracy (via the Heartbeat Counting Task) and interoceptive sensibility (via Noticing, Not-Distracting and Trusting subscales of the Multidimensional Assessment of Interoceptive Awareness questionnaire, MAIA). We tested whether these interoceptive abilities were related to: i) trait dissociation (measured via the Dissociation Questionnaire, DIS-Q), and ii) to transient experimentally induced dissociation elicited through the Mirror Gazing Task (MGT), a validated paradigm known to induce mild dissociative experiences. After the task, participants completed the Clinician Administered Dissociative State Scale (CADSS) and additional ad-hoc items designed to assess changes in self-perception. To assess whether induced dissociation was accompanied by affective or physiological changes, we collected Positive and Negative Affect Schedule (PANAS), State-Trait Anxiety Inventory (STAI), Heart Rate (HR), and Heart Rate Variability (HRV) measures. The MGT effectively induced state dissociation. However, no task-related effect was observed for interoceptive accuracy as measured by the Heartbeat Counting Task. Both state and trait dissociation were negatively associated with specific dimensions of interoceptive sensibility (i.e., Noticing, Not-Distracting, and Trusting). Overall, these results highlight a link between non-pathological dissociation and specific interoceptive beliefs.