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Brain correlates of hypnotic paralysis-a resting-state fMRI study
1Section BrainImaging, Department of Psychiatry and Psychotherapy, University of Marburg, Marburg, Germany. martin.pyka@med.uni-marburg.de
Neuroimage
|April 19, 2011
Summary
Hypnotic paralysis, studied using functional MRI (fMRI), reveals altered brain connectivity. The precuneus shows increased links to other brain regions, suggesting its role in altered consciousness states.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Hypnotic paralysis, a phenomenon studied since Charcot, offers insights into altered consciousness.
- The neurobiological underpinnings of hypnotic paralysis remain largely unexplored.
Purpose of the Study:
- To investigate the neurobiological correlates of hypnotic paralysis using resting-state functional magnetic resonance imaging (fMRI).
- To examine brain function in core regions of the default mode network and the primary motor cortex during hypnotic paralysis.
Main Methods:
- Nineteen participants underwent hypnotic suggestion to induce left-hand paralysis.
- Resting-state fMRI at 3T was conducted in both awake and hypnotic states in a pseudo-randomized order.
- Functional connectivity analyses were performed to assess brain region interactions.
Main Results:
- Increased functional connectivity was observed between the precuneus and the right dorsolateral prefrontal cortex, angular gyrus, and a dorsal part of the precuneus.
- Functional connectivity involving the medial frontal cortex and the primary motor cortex remained unchanged during hypnotic paralysis.
- These findings highlight altered network dynamics within the default mode network.
Conclusions:
- The precuneus plays a critical role in maintaining altered states of consciousness, such as hypnotic paralysis.
- Enhanced coupling of specific cortical areas with the precuneus suggests that hypnotic paralysis involves a modified self-representation impacting motor control.
