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Hysterical conversion and brain function.

Patrik Vuilleumier1

  • 1Laboratory for Behavioral Neurology and Imaging of Cognition, Clinic of Neurology, University University of Geneva, Geneva, Switzerland. patrik.vuilleumier@medecine.unige.ch

Progress in Brain Research
|September 28, 2005
PubMed
Summary
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Functional brain imaging reveals that hysterical conversion disorders involve altered activity in motor and sensory brain circuits, not conscious attention deficits. These findings suggest stress-related factors modulate neural networks, impacting self-awareness.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Neurology

Background:

  • Hysterical conversion disorders present unexplained neurological deficits, often linked to psychogenic stress.
  • The precise neural mechanisms underlying these functional neurological symptoms remain largely unknown.

Observation:

  • Functional neuroimaging studies (EEG, fMRI, PET, SPECT) investigate neural correlates of hysterical conversion symptoms.
  • Previous research explored neuropsychological accounts of hysteria.

Findings:

  • Neuroimaging shows decreased activity in motor and sensory circuits during paralysis and anesthesia, respectively.
  • Increased limbic system activation (cingulate, orbitofrontal cortex) observed during conversion symptoms.
  • Findings challenge attentional exclusion theories, suggesting affective/stress modulation of sensorimotor networks.

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Implications:

  • Results indicate dynamic interactions between limbic and sensorimotor networks, potentially involving primitive protective mechanisms.
  • Future research should focus on functional connectivity to understand the neuropsychobiology of conversion disorders.
  • Improved understanding may enhance clinical management and offer insights into self-awareness mechanisms.