An interoceptive illusion of effort induced by false heart-rate feedback

Pierpaolo Iodice, Giuseppina Porciello, Ilaria Bufalari, Laura Barca, Giovanni Pezzulo

Research output: Contribution to journalArticle

Abstract

Interoception, or the sense of the internal state of the body, is key to the adaptive regulation of our physiological needs. Recent theories contextualize interception within a predictive coding framework, according to which the brain both estimates and controls homeostatic and physiological variables, such as hunger, thirst, and effort levels, by orchestrating sensory, proprioceptive, and interoceptive signals from inside the body. This framework suggests that providing false interoceptive feedback may induce misperceptions of physiological variables, or “interoceptive illusions.” Here we ask whether it is possible to produce an illusory perception of effort by giving participants false acoustic feedback about their heart-rate frequency during an effortful cycling task. We found that participants reported higher levels of perceived effort when their heart-rate feedback was faster compared with when they cycled at the same level of intensity with a veridical feedback. However, participants did not report lower effort when their heart-rate feedback was slower, which is reassuring, given that failing to notice one’s own effort is dangerous in ecologically valid conditions. Our results demonstrate that false cardiac feedback can produce interoceptive illusions. Furthermore, our results pave the way for novel experimental manipulations that use illusions to study interoceptive processing.

Original languageEnglish
Pages (from-to)13897-13902
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number28
DOIs
Publication statusPublished - Jan 1 2019

Keywords

  • Heartbeat
  • Illusion of effort
  • Interoception
  • Interoceptive illusion

ASJC Scopus subject areas

  • General

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