Reduced gray matter volume in the anterior cingulate, orbitofrontal cortex and thalamus as a function of mild depressive symptoms: a voxel-based morphometric analysis

Studies investigating structural brain abnormalities in depression have typically employed a categorical rather than dimensional approach to depression [i.e., comparing subjects with Diagnostic and Statistical Manual of Mental Disorders (DSM)-defined major depressive disorder (MDD) v. healthy contro...

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Bibliographic Details
Published in:Psychological medicine 2014-10, Vol.44 (13), p.2833-2843
Main Authors: Webb, C. A., Weber, M., Mundy, E. A., Killgore, W. D. S.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Adult and adolescent clinical studies
Anatomy & physiology
Biological and medical sciences
Brain
Depression
Depression - pathology
Female
Gray Matter - pathology
Gyrus Cinguli - pathology
Humans
Male
Medical imaging
Medical sciences
Mental depression
Middle Aged
Miscellaneous
Mood disorders
Original Articles
Prefrontal Cortex - pathology
Psychology. Psychoanalysis. Psychiatry
Psychopathology
Psychopathology. Psychiatry
Thalamus - pathology
Volume
Young Adult
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Summary:Studies investigating structural brain abnormalities in depression have typically employed a categorical rather than dimensional approach to depression [i.e., comparing subjects with Diagnostic and Statistical Manual of Mental Disorders (DSM)-defined major depressive disorder (MDD) v. healthy controls]. The National Institute of Mental Health, through their Research Domain Criteria initiative, has encouraged a dimensional approach to the study of psychopathology as opposed to an over-reliance on categorical (e.g., DSM-based) diagnostic approaches. Moreover, subthreshold levels of depressive symptoms (i.e., severity levels below DSM criteria) have been found to be associated with a range of negative outcomes, yet have been relatively neglected in neuroimaging research. To examine the extent to which depressive symptoms--even at subclinical levels--are linearly related to gray matter volume reductions in theoretically important brain regions, we employed whole-brain voxel-based morphometry in a sample of 54 participants. The severity of mild depressive symptoms, even in a subclinical population, was associated with reduced gray matter volume in the orbitofrontal cortex, anterior cingulate, thalamus, superior temporal gyrus/temporal pole and superior frontal gyrus. A conjunction analysis revealed concordance across two separate measures of depression. Reduced gray matter volume in theoretically important brain regions can be observed even in a sample that does not meet DSM criteria for MDD, but who nevertheless report relatively elevated levels of depressive symptoms. Overall, these findings highlight the need for additional research using dimensional conceptual and analytic approaches, as well as further investigation of subclinical populations.
ISSN:0033-2917
1469-8978
DOI:10.1017/S0033291714000348