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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
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Illusory own body perceptions mapped in the cingulate cortex-An intracranial stimulation study.

Irina Popa1,2, Andrei Barborica3,4, Julia Scholly5

  • 1Neurology Department, University Emergency Hospital Bucharest, Bucharest, Romania.

Human Brain Mapping
|March 15, 2019
PubMed
Summary

The cingulate cortex plays a role in body awareness. Electrical stimulation revealed it influences body perception by altering brain connectivity, particularly involving the insula.

Keywords:
bodily self-consciousnessbody representationcingulate cortexintracranial high-frequency stimulationstereo-electroencephalography

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neurology

Background:

  • Body awareness arises from sensory integration, primarily in the posterior parietal cortex.
  • The precise role of the cingulate cortex in constructing body representation remains under investigation.

Purpose of the Study:

  • To investigate the involvement of the cingulate cortex in the representation of the human body.
  • To understand how stimulating the cingulate cortex affects body perception and brain connectivity.

Main Methods:

  • Retrospective analysis of stereo-electroencephalography data from drug-resistant epilepsy patients.
  • High-frequency electrical stimulation of the cingulate cortex outside the epileptogenic zone.
  • Assessment of brain connectivity using the h² coefficient and nonlinear regression analysis of EEG signals.

Main Results:

  • Electrical stimulation of the cingulate cortex elicited various body perception changes, including sensations of movement, weight, pressure, and detachment.
  • These changes correlated with decreased connectivity in the dominant posterior insula.
  • Increased connectivity was observed in other cortical structures, predominantly in the nondominant hemisphere.

Conclusions:

  • The cingulate cortex is implicated in modulating body perception.
  • Altered brain connectivity, particularly involving the insula and interhemispheric interactions, underlies cingulate cortex-induced body awareness changes.