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Embodiment in episodic memory through premotor-hippocampal coupling.

Nathalie Heidi Meyer1, Baptiste Gauthier1,2, Sara Stampacchia1

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Sense of agency (SoA) enhances episodic memory (EM) by strengthening hippocampal reinstatement during recall. This neural coupling between bodily self-signals and memory retrieval enables a continuous sense of self over time.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Memory Research

Background:

  • Episodic memory (EM) involves recalling past events and is linked to brain activity reinstatement.
  • The sense of agency (SoA), derived from bodily signals, is crucial for self-identity but its link to EM is unexplored.

Purpose of the Study:

  • To experimentally investigate the relationship between SoA and EM.
  • To determine if SoA influences the neural reinstatement of encoded memories.
  • To explore the neural mechanisms linking bodily self-perception to episodic memory.

Main Methods:

  • Utilized real-time sensorimotor stimulation and immersive virtual reality to manipulate SoA.
  • Employed functional magnetic resonance imaging (fMRI) to measure brain activity during memory tasks.
  • Tested a severe amnesic patient to assess memory dependencies on SoA.

Main Results:

  • Preserved SoA during encoding led to stronger hippocampal reinstatement of scenes, correlating with better recall.
  • Hippocampal reinstatement was coupled with activity in the premotor cortex, a key SoA region.
  • An amnesic patient showed a lack of SoA dependency in memory recall.

Conclusions:

  • SoA significantly modulates hippocampal reinstatement in episodic memory.
  • Neural coupling between premotor cortex and hippocampus underlies the influence of bodily self on memory.
  • These findings reveal a mechanism for how the bodily self contributes to a continuous sense of self across time.