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Decoding illusory self-location from activity in the human hippocampus.

Arvid Guterstam1, Malin Björnsdotter2, Loretxu Bergouignan3

  • 1Department of Neuroscience, Karolinska Institutet, Stockholm Sweden.

Frontiers in Human Neuroscience
|August 4, 2015
PubMed
Summary
This summary is machine-generated.

Researchers used an out-of-body illusion to show that the hippocampus is active during the feeling of being in a specific location. This suggests the hippocampus helps construct our sense of self-location in space.

Keywords:
body perceptionmultisensory integrationperceptual illusionself-consciousnessself-location

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • The hippocampus is known for its roles in spatial navigation and memory.
  • Empirical evidence directly linking hippocampal activity to the subjective experience of self-location is limited.

Purpose of the Study:

  • To investigate the role of the hippocampus in the perceptual experience of bodily self-location.
  • To determine if hippocampal activity patterns can predict illusory self-location.

Main Methods:

  • Utilized a multisensory out-of-body illusion in six healthy participants during high-resolution functional magnetic resonance imaging (fMRI).
  • Manipulated first-person visual perspective and delivered synchronous or asynchronous visuo-tactile stimulation to induce or negate the illusion of self-location.
  • Employed pattern classification to decode illusory self-location from hippocampal activity.

Main Results:

  • Illusory self-location was successfully decoded from hippocampal activity in the synchronous stimulation condition (P < 0.05).
  • Decoding accuracy was significantly higher for synchronous compared to asynchronous stimulation (P = 0.012).
  • No significant decoding was observed in the asynchronous (control) condition (P > 0.05).

Conclusions:

  • Hippocampal activity is associated with the perceived location of the bodily self in space.
  • These findings extend the known functions of the hippocampus beyond spatial navigation and memory to include the construction of self-location.
  • The study provides neural evidence for the hippocampus's involvement in our sense of being physically present in an environment.