Trait and state interoceptive abnormalities are associated with dissociation and seizure frequency in patients with functional seizures

Koreki, Akihiro, Garfkinel, Sarah N, Mula, Marco, Agrawal, Niruj, Cope, Sarah, Eilon, Talia, Gould Van Praag, Cassandra, Critchley, Hugo D, Edwards, Mark and Yogarajah, Mahinda (2020) Trait and state interoceptive abnormalities are associated with dissociation and seizure frequency in patients with functional seizures. Epilepsia, 61 (6). pp. 1156-1165. ISSN 0013-9580

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Abstract

Objective
Dissociative traits represent a disturbance in selfhood that may predispose to, and trigger, functional seizures (FSs). The predictive representation and control of the internal physiological state of the body (interoception) are proposed to underpin the integrity of the sense of self (“minimal selfhood”). Therefore, discrepancies between objective and subjective aspects of interoception may relate to symptom expression in patients with FSs. Here, we tested whether individual differences in trait measures of interoception relate to dissociative symptoms, and whether state interoceptive deficits predict FS occurrence.

Methods
Forty‐one participants with FSs and 30 controls completed questionnaire ratings of dissociation, and measures of (1) interoceptive accuracy (IA)—objective performance on heartbeat detection tasks; (2) trait interoceptive sensibility—subjective sensitivity to internal sensations (using the Porges Body Perception Questionnaire); and (3) state interoceptive sensibility—subjective trial‐by‐trial measures of confidence in heartbeat detection. Interoceptive trait prediction error (ITPE) was calculated from the discrepancy between IA and trait sensibility, and interoceptive state prediction error (ISPE) from the discrepancy between IA and state sensibility.

Results
Patients with FSs had significantly lower IA and greater trait interoceptive sensibility than healthy controls. ITPE was the strongest predictor of dissociation after controlling for trait anxiety and depression in a regression model. ISPE correlated significantly with FS frequency after controlling for state anxiety.

Significance
Patients with FSs have disturbances in interoceptive processing that predict both dissociative traits reflecting the disrupted integrity of self‐representation, and the expression of FSs. These findings provide insight into the pathophysiology of functional neurological disorder, and could lead to novel diagnostic and therapeutic approaches.

Item Type: Article
Keywords: dissociation, dissociative seizures, functional seizures, interoception, nonepileptic attack disorder, psychogenic nonepileptic seizures, Adult, Anxiety, Awareness, Dissociative Disorders, Female, Heart Rate, Humans, Interoception, Male, Neuropsychological Tests, Seizures
Schools and Departments: Brighton and Sussex Medical School > Neuroscience
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 12 Apr 2021 07:51
Last Modified: 12 Apr 2021 08:00
URI: http://sro.sussex.ac.uk/id/eprint/98375

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