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Frontal lobe dysfunction in secondary depression

H S Mayberg1

  • 1Department of Medicine (Neurology), University of Texas Health Science Center at San Antonio 78284-6240.

The Journal of Neuropsychiatry and Clinical Neurosciences
|January 1, 1994
PubMed
Summary
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Depression in neurological disease, especially basal ganglia disorders, shows brain metabolism changes. Similar patterns in primary depression suggest disrupted paralimbic pathways contribute to mood regulation issues.

Area of Science:

  • Neuroscience
  • Neurology
  • Psychiatry

Background:

  • Depression frequently affects patients with neurological diseases, particularly those involving the basal ganglia.
  • The underlying mechanisms of mood disorders in these neurological conditions remain poorly understood.
  • Selective neural pathways impacted by basal ganglia injury offer potential targets for functional imaging studies.

Purpose of the Study:

  • To investigate the neuroanatomical basis of depression in patients with neurological diseases, specifically those affecting the basal ganglia.
  • To compare patterns of brain metabolism in depressed neurological patients with those in primary unipolar depression.

Main Methods:

  • Review of studies utilizing positron-emission tomography (PET) to assess regional cerebral glucose metabolism.

Related Experiment Videos

  • Analysis of functional imaging data in patients with neurological diseases and depression.

    • Main Results:

    • Identified bilateral hypometabolism in the orbital-inferior prefrontal cortex and anterior temporal cortex in depressed subjects.
    • This metabolic pattern was observed irrespective of the underlying disease etiology.
    • The observed pattern in neurological depression mirrors findings in primary unipolar depression.

    Conclusions:

    • Disruption of paralimbic pathways connecting the frontal cortex, temporal cortex, and striatum may underlie depression in basal ganglia disease.
    • These findings support the concept of a specific neuroanatomical locus for mood regulation.
    • The study highlights shared neural mechanisms between primary depression and depression secondary to neurological conditions.