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Suicidal behavior is associated with reduced corpus callosum area.

Fabienne Cyprien1, Philippe Courtet, Alain Malafosse

  • 1Institut National de la Sante et de la Recherche Medicale (INSERM), Unit 1061, Neuropsychiatry, Epidemiological and Clinical Research, La Colombière Hospital, Montpellier, France.

Biological Psychiatry
|May 3, 2011
PubMed
Summary

Individuals who attempted suicide showed significantly smaller posterior corpus callosum (CC) size, suggesting impaired brain connectivity may play a role in suicidal behavior.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Neuroimaging

Background:

  • Corpus callosum (CC) size is linked to cognitive and emotional deficits in various neuropsychiatric and mood disorders.
  • Suicidal behavior is also associated with such deficits, prompting investigation into CC structure.

Purpose of the Study:

  • To investigate the association between corpus callosum (CC) atrophy and suicidal behavior.
  • To determine if CC size differs between individuals with a history of suicide attempts and control groups.

Main Methods:

  • Studied 435 non-demented, right-handed individuals aged 65+ from the ESPRIT study.
  • Categorized participants into suicide attempters (n=21), affective controls (n=180), and healthy controls (n=234).
  • Measured midsagittal areas of anterior, mid, and posterior CC using T1-weighted MRI; analyzed using multivariate analysis of covariance.

Main Results:

  • The posterior third of the CC was significantly smaller in suicide attempters compared to both affective controls (p=.020) and healthy controls (p=.010).
  • No significant differences in posterior CC size were found between affective controls and healthy controls.
  • No significant differences were observed in the anterior or mid sections of the CC across groups.

Conclusions:

  • Reduced posterior CC size in individuals with a history of suicide suggests diminished interhemispheric connectivity.
  • This finding points to a potential role of the corpus callosum in the pathophysiology of suicidal behavior.
  • Further research is needed to confirm these morphometric differences and explore underlying cellular mechanisms.