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Murphy, Christopher F; Gunning-Dixon, Faith M; Hoptman, Matthew J; Lim, Kelvin O; Ardekani, Babak; Shields, Jessica K; Hrabe, Jan; Kanellopoulos, Dora; Shanmugham, Bindu R; Alexopoulos, George S
Biological psychiatry (1969), 04/2007, Letnik: 61, Številka: 8Journal Article
Background This study tested the hypothesis that microstructural white matter abnormalities in frontostriatal-limbic tracts are associated with poor response inhibition on the Stroop task in depressed elders. Method Fifty-one elders with major depression participated in a 12-week escitalopram trial. Diffusion tensor imaging was used to determine fractional anisotropy (FA) in white matter regions. Executive function (response inhibition) was assessed with the Stroop task. Voxelwise correlational analysis was used to examine the relationship between Stroop performance and fractional anisotropy. Results Significant associations between FA and Stroop color word interference were evident in multiple frontostriatal-limbic regions, including white matter lateral to the anterior and posterior cingulate cortex and white matter in prefrontal, insular, and parahippocampal regions. Conclusions These findings suggest that microstructural white matter abnormalities of frontostriatal-limbic networks are associated with executive dysfunction of late-life depression. This observation provides the rationale for examination of specific frontostriatal-limbic pathways in the pathophysiology of geriatric depression.
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in: SICRIS
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