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Altered connectivity between prefrontal and sensorimotor cortex in conversion paralysis.

Floris P de Lange¹, Ivan Toni, Karin Roelofs

¹Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen, Kapittelweg 29, 6500 HB Nijmegen, Netherlands. floris.delange@donders.ru.nl

Neuropsychologia

|March 9, 2010

Summary

This summary is machine-generated.

Conversion paralysis (CP) involves impaired motor function. This study reveals altered connectivity between the dorsolateral prefrontal cortex and sensorimotor areas in CP patients, potentially explaining reduced motor responsiveness.

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Area of Science:

Neuroscience
Psychiatry
Cognitive Neurology

Background:

Conversion paralysis (CP) is a common psychiatric disorder impacting voluntary motor control.
Previous research shows similar motor system recruitment for imagined movements in affected and unaffected limbs of CP patients.
Increased prefrontal activation during affected limb imagery in CP patients is noted, but its link to motor system hypo-responsiveness is unclear.

Purpose of the Study:

To investigate functional connectivity between the prefrontal cortex (PFC) and sensorimotor regions in CP patients during imagined hand movements.
To determine if connectivity patterns differ based on the imagined hand (affected vs. unaffected).
To explore the relationship between PFC-motor connectivity and reduced motor responsiveness in CP.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to assess brain activity and connectivity.
Participants with unilateral conversion paresis imagined movements of their affected and unaffected hands.
Inter-regional coupling between PFC subregions and sensorimotor areas was analyzed.

Main Results:

Distinct connectivity patterns were observed for different PFC regions.
Ventromedial PFC showed no functional connection to the motor system.
Strong functional coupling between dorsolateral PFC and sensorimotor areas was found, modulated by the imagined hand.

Conclusions:

Altered dorsolateral prefrontal-motor connectivity may underlie the reduced motor responsiveness characteristic of conversion paralysis.
Findings highlight the role of specific PFC-motor network dysfunctions in CP.
This research provides insights into the neurobiological mechanisms of conversion paralysis.