Interoception refers to the processing of internal bodily stimuli, while body image refers to appearance-related perceptions, affect, and cognitions. Previous research has found that body image is associated with self-reported and behavioural indices of interoception. Here, we extended this research by examining associations between measures of positive (i.e., body appreciation, functionality appreciation) and negative body image (i.e., body shame, weight preoccupation) and two electrophysiological indices of interoceptive processing, namely the heartbeat evoked potential (HEP) and gastric-alpha phase-amplitude coupling (PAC), in a sample of 36 adults. Significant negative associations were identified between the indices of negative body image and the interoception variables. Specifically, more negative HEP amplitude and lower gastric-alpha PAC were both associated with greater body shame and weight preoccupation. However, no significant associations were identified for the indices of positive body image. These findings extend previous work by demonstrating that there are significant associations between negative body image and previously unexplored components of cardiac and gastric interoception. This, in turn, could have important clinical applications, such as the HEP and gastric-alpha PAC both serving as biomarkers of negative body image.
Interpersonal distance (IPD) refers to the distance naturally maintained during social interactions, while peripersonal space (PPS) refers to the immediate space surrounding the body, or the space within reaching distance. Previous research has preliminarily indicated that IPD is associated with body image disturbances. We sought to expand extant literature by exploring associations between aspects of positive and negative body image, IPD, and PPS. Seventy-five women from the United Kingdom aged 18-40 years completed measures of body appreciation, body image flexibility, body shame, body surveillance, and body dissatisfaction. IPD boundaries were estimated using a lab-based comfort-distance task, whereas PPS boundaries were estimated using an audio-tactile reaction-time task. Measures of body acceptance by others and fear of negative evaluation were completed as potential mediators. Overall, we identified positive associations between IPD, body surveillance, and fear of negative evaluation, with no statistically significant associations identified between the other indices. The association between active IPD and body surveillance was mediated by fear of negative evaluation, even after controlling for demographic factors. These findings suggest a nuanced relationship between IPD and body image-related factors, highlighting the role of social evaluation anxiety. Future investigations should use experimental designs to further understand these relationships and their implications.
Autonomous Sensory Meridian Response (ASMR) is a complex sensory-perceptual phenomenon characterised by relaxing and pleasurable scalp-tingling sensations. The ASMR trait is nonuniversal, thought to have developmental origins, and a prevalence rate of 20%. Previous theory and research suggest that trait ASMR may be underlined by atypical multisensory perception from both interoceptive and exteroceptive modalities. In this study, we examined whether ASMR responders differed from nonresponders in interoceptive accuracy and multisensory processing style. Results showed that ASMR responders had lower interoceptive accuracy but a greater tendency towards sensation seeking, especially for tactile, olfactory, and gustatory modalities. Exploratory mediation analyses suggest that sensation-seeking behaviours in trait ASMR could reflect a compensatory mechanism for either deficits in interoceptive accuracy, a tendency to weight exteroceptive signals more strongly, or both. This study provides the foundations for understanding how interoceptive and exteroceptive mechanisms might explain not only the ASMR trait, but also individual differences in the ability to experience complex positive emotions more generally.