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Corpus callosum abnormalities in psychopathic antisocial individuals
Adrian Raine1, Todd Lencz, Kristen Taylor
1Department of Psychology, University of Southern California, Los Angeles, CA 90089-1061, USA. raine@usc.edu
Archives of General Psychiatry
|November 12, 2003
Summary
Psychopathic individuals show distinct corpus callosum abnormalities, including increased white matter volume and altered thickness, potentially explaining affective deficits. These structural differences are linked to neurodevelopmental variations.
Area of Science:
- Neuroscience
- Psychiatry
- Neuroimaging
Background:
- Previous research linked psychopathic antisocial individuals to abnormal interhemispheric processing.
- Structural characteristics of the corpus callosum in this group remained unstudied.
Purpose of the Study:
- Assess structural and functional corpus callosum impairments in psychopathic individuals with antisocial personality disorder.
- Examine correlations between callosal structure and psychopathy.
- Investigate associations between callosal abnormalities and affective/psychosocial deficits.
Main Methods:
- Case-control study with 15 psychopathic men and 25 controls from a community sample.
- Structural MRI to measure corpus callosum volume, thickness, length, and areas.
- Functional tasks assessed interhemispheric connectivity.
- Electrodermal and cardiovascular measures during social stress.
Main Results:
- Psychopathic individuals exhibited increased callosal white matter volume (+22.6%) and length (+6.9%), with reduced thickness (-15.3%).
- Enhanced functional interhemispheric connectivity was observed.
- Callosal abnormalities correlated with affective deficits, low stress reactivity, and reduced spatial ability, independent of psychosocial deficits.
Conclusions:
- Corpus callosum abnormalities in psychopathic individuals may stem from atypical neurodevelopment, such as altered axonal pruning or myelination.
- These findings may elucidate affective deficits and abnormal interhemispheric transfer in psychopathy.