Mechanismen nichtorganischer Lähmungen: Bewegungswahrnehmung und Bewegungsausführung unter hypnotisch induzierter Lähmung. Eine fMRT-Studie
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Philipps-Universität Marburg
Abstract
The neurobiological correlates of nonorganic movement disorders are largely
unresolved. Since conversion disorder and hypnotic states have many features
in common, a paradigm established in conversion disorder was used to
investigate hypnotic paralysis.
While engaging in an active movement imitation and a passive movement
observation task, nineteen healthy subjects were investigated by functional
magnetic resonance imaging with and without hypnotically induced paralysis of
one hand. Cerebral activation changes were explored in a multivariate general
linear model, by means of factor analysis and by computing functional
connectivities.
Movement imitation under hypnotic paralysis resulted in a hypoactivation of the
contralateral primary motor cortex and the ipsilateral cerebellum, as well as
hyperactivation of the contralateral anterior cingulate cortex (ACC), middle
frontal gyrus (MFG) and insula. No such paralysis specific effects were obtained
in the observation condition.
These data suggest that MFG, ACC and insula are involved in hypnotic
paralysis by constant self-monitoring and conflict-detecting processes, a rerepresentation
of interoception, a mediation of the feeling of agency, an
adjustment of executive processes and possibly a modification of intention.
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This item has been published with the following license: In Copyright