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White matter microstructure and local coherence of functional MRI in major depression

Published online by Cambridge University Press:  19 July 2023

S. Breit ,
N. Denier ,
N. Mertse ,
S. Walther ,
A. Federspiel ,
R. Wiest  and
T. Bracht
S. Breit*
Affiliation:
University Hospital of Psychiatry and Psychotherapy, University of Bern Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Bern
N. Denier
Affiliation:
University Hospital of Psychiatry and Psychotherapy, University of Bern Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Bern
N. Mertse
Affiliation:
University Hospital of Psychiatry and Psychotherapy, University of Bern Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Bern
S. Walther
Affiliation:
University Hospital of Psychiatry and Psychotherapy, University of Bern Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Bern
A. Federspiel
Affiliation:
Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Bern
R. Wiest
Affiliation:
Institute of Diagnostic and Interventional Neuroradiology, University of Bern, Bern, Switzerland
T. Bracht
Affiliation:
University Hospital of Psychiatry and Psychotherapy, University of Bern Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Bern
*
*Corresponding author.

Abstract

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Introduction

Anhedonia is a loss of pleasure and interest in activities and a core symptom of major depressive disorder (MDD). Diffusion tensor imaging studies show evidence for white matter (WM) alterations in the superior longitudinal fasciculus (SLF) of patients with MDD, already in the early stage of illness. SLF fibers extend from the parietal lobe to prefrontal regions that are important for attention, motivation, decision-making and reward processing.

Objectives

The present study focuses on the relationship between WM-integrity and anhedonia in patients with MDD. We hypothesize that WM-alterations are present in the SLF of depressed patients with motivational anhedonia.

Methods

Thirty-nine patients with MDD and 19 healthy controls matched for age and gender underwent diffusion-weighted magnetic resonance imaging. Voxel-wise statistical analysis of fractional anisotropy (FA) data was performed using FSL-Tract-Based Spatial Statistics (TBSS) software. Whole brain voxel-wise comparison in local coherence (LCOR), a measurement of resting state fMRI connectivity strength between a given voxel and the neighbouring areas in the brain, were compared between patients and healthy controls. We used the sum value of item 1 and 7 of the Hamilton rating Scale for depression (HAM-D) and the CORE non-interactiveness value to assess motivational anhedonia.

Results

TBSS-analyses revealed reduced FA in the left SLF of depressed patients and we found a correlation with motivational anhedonia and LCOR in temporo-parietal regions of depressed patients.

Conclusions

These findings suggest that WM-alterations in the SLF might be associated with motivational aspects of anhedonia and predict motivation of reward in MDD.

Disclosure of Interest

None Declared

Type
Abstract
Information
European Psychiatry , Volume 66 , Special Issue S1: Abstracts of the 31st European Congress of Psychiatry , March 2023 , pp. S551 - S552
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of the European Psychiatric Association
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