[Neuroimaging studies of depression: Current status and future direction.]

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Major Depressive Disorder (MDD) is biologically heterogeneous, complicating understanding of its neurobiological mechanisms.
• Current understanding of MDD's biological underpinnings remains incomplete due to its complex symptom spectrum.
• Viewing MDD as a network abnormality rather than localized deficits offers a more promising research direction.

Purpose of the Study:

• To comprehensively review existing neuroimaging literature on Major Depressive Disorder (MDD).
• To present novel neuroimaging studies for MDD.
• To explore the potential of neuroimaging as a biomarker for MDD diagnosis and treatment.

Main Methods:

• Review of structural and functional magnetic resonance imaging (MRI) studies.
• Inclusion of magnetic resonance spectroscopy (MRS), single-photon emission computed tomography (SPECT), and positron emission tomography (PET) studies.
• Presentation of original neuroimaging data from MDD patients.

Main Results:

• Extensive review of diverse neuroimaging techniques applied to MDD.
• Demonstration of neuroimaging data relevant to MDD.
• Identification of potential neuroimaging biomarkers for MDD.

Conclusions:

• Neuroimaging offers valuable insights into the neural dysfunction in MDD.
• MDD may be better understood as a network disorder.
• Further development of neuroimaging biomarkers could improve MDD diagnosis and treatment.