Lost in time and space? Multisensory processing of peripersonal space and time perception in people with frequent experiences of depersonalisation.
Francesca Ferroni, Edoardo Arcuri, Martina Ardizzi, Nicola Chinchella, Vittorio Gallese, Anna Ciaunica
Quarterly journal of experimental psychology (2006) June 1, 2025 DOI: 10.1177/17470218241261645
Summary
Individuals experiencing high levels of depersonalisation (DP) show a significant impairment in time perception, struggling to locate past and future events relative to their present. In a study of 120 participants, those with high DP scores performed poorly on the mental time travel task, while those with low DP exhibited significant variability in their temporal accuracy. Interestingly, perceptions of peripersonal space remained unchanged between high and low DP groups. This highlights the intricate relationship between self-perception and how we process time and space, affecting well-being.
Abstract
Perception of one's own body in time and space is a fundamental aspect of self-consciousness. It scaffolds our subjective experience of being present, in the here and now, a vital condition for our survival and well-being. Depersonalisation (DP) is characterised by a distressing feeling of being "spaced out," detached from one's self, as well as atypical "flat" time perception. Using an audio-tactile paradigm, we conducted a study looking at the effect of DP experiences on peripersonal space (PPS)-the space close to the body-and time perception. Strikingly, we found no difference in PPS perception in people with higher DP experiences (High DPe) versus low occurrences of DP experiences (Low DPe). To assess time perception, we used the mental time travel (MTT) task measuring the individuals' capacity to take one's present as a reference point for situating personal versus general events in the past and the future. We found an overall poorer performance in locating events in time relative to their present reference point in High DPe. By contrast, Low DPe showed significant variation in performance when answering to relative past events, while High DPe did not. Our study sheds light on the close link between altered sense of self and egocentric spatiotemporal perception in individuals with DP experiences, the third most common psychological symptom in the general population.