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Related Experiment Videos

Mapping brain size and cortical gray matter changes in elderly depression.

Martina Ballmaier1, Elizabeth R Sowell, Paul M Thompson

  • 1Laboratory of Neuro Imaging, Department of Neurology, David Geffen UCLA School of Medicine, 710 Westwood Plaza, Los Angeles, CA 90095-1769, USA.

Biological Psychiatry
|February 13, 2004
PubMed
Summary

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Elderly depression is linked to brain size reductions in the orbitofrontal cortex. Gray matter changes in the orbitofrontal cortex and temporoparietal regions offer new insights into depression pathophysiology.

Area of Science:

  • Neuroimaging
  • Geriatric Psychiatry
  • Neuroscience

Background:

  • Elderly depression shows frontal lobe and hippocampus abnormalities.
  • Previous studies have not mapped entire cortical surface abnormalities in major depression.
  • This study analyzes brain size and gray matter in the cortical mantle of elderly depressed patients.

Purpose of the Study:

  • To conduct detailed spatial analyses of brain size and gray matter.
  • To investigate cortical abnormalities across the entire brain surface in elderly major depression.

Main Methods:

  • Used high-resolution 3D structural MRI and cortical pattern matching.
  • Analyzed 24 depressed elderly patients and 19 age-matched controls.
  • Measured local brain size and gray matter at thousands of cortical surface locations.

Related Experiment Videos

Main Results:

  • Observed significant brain size reductions in the bilateral orbitofrontal cortex of depressed subjects.
  • Found significant gray matter increases in the orbitofrontal cortex, with focal decreases nearby.
  • Detected gray matter increases in parietal and left temporal cortices in depressed patients.

Conclusions:

  • Complex cortical changes may explain orbitofrontal cortex size reduction.
  • Abnormalities in orbitofrontal cortex and temporoparietal gray matter are linked to depression.
  • These findings provide new insights into the pathophysiology of elderly depression.