Abnormal interhemispheric connectivity in male psychopathic offenders

Area of Science:

• Neuroscience
• Psychiatry
• Forensic Psychology

Background:

• Psychopathic offenders display interpersonal norm violations and aggressive behaviors.
• Affective and cognitive deficits in psychopathy are linked to abnormal functional interhemispheric connectivity.
• Direct neurophysiological evidence for this dysfunctional connectivity in psychopathy is limited.

Purpose of the Study:

• To investigate interhemispheric functional connectivity in psychopathic offenders using neurophysiological methods.
• To examine local cortical processes, including intracortical inhibition and facilitation, in psychopathic offenders.
• To provide direct neurophysiological evidence for brain connectivity abnormalities in psychopathy.

Main Methods:

• Utilized transcranial magnetic stimulation (TMS) combined with electroencephalography (EEG).
• Examined interhemispheric connectivity in the dorsolateral and motor cortex of psychopathic offenders and healthy controls.
• Measured intracortical inhibition and facilitation in the left and right motor cortex.

Main Results:

• Observed global abnormalities in right-to-left functional connectivity in psychopathic offenders compared to controls.
• Psychopathic offenders showed increased intracortical inhibition in the right hemisphere, unlike controls.
• No significant difference in intracortical inhibition was found in the left hemisphere between groups.

Conclusions:

• This study presents the first neurophysiological evidence of abnormal interhemispheric connectivity in psychopathic offenders.
• Findings suggest that altered brain connectivity contributes to the antisocial behavior characteristic of psychopathy.
• Further research with larger sample sizes is needed to specify connectivity abnormalities in relation to specific brain regions like the dorsolateral prefrontal cortex.