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Type: Journal article
Title: Switching between executive and default mode networks in posttraumatic stress disorder: alterations in functional connectivity
Author: Daniels, J.
McFarlane, A.
Bluhm, R.
Moores, K.
Clark, C.
Shaw, M.
Williamson, P.
Densmore, M.
Lanius, R.
Citation: Journal of Psychiatry & Neuroscience, 2010; 35(4):258-266
Publisher: Canadian Medical Association
Issue Date: 2010
ISSN: 1180-4882
Statement of
Judith K. Daniels, Alexander C. McFarlane, Robyn L. Bluhm, Kathryn A. Moores, C. Richard Clark, Marnie E. Shaw, Peter C. Williamson, Maria Densmore, Ruth A. Lanius
Abstract: UNLABELLED: Working memory processing and resting-state connectivity in the default mode network are altered in patients with posttraumatic stress disorder (PTSD). Because the ability to effortlessly switch between concentration on a task and an idling state during rest is implicated in both these alterations, we undertook a functional magnetic resonance imaging study with a block design to analyze task-induced modulations in connectivity. METHODS: We performed a working memory task and psychophysiologic interaction analyses with the posterior cingulate cortex and the medial prefrontal cortex as seed regions during fixation in 12 patients with severe, chronic PTSD and 12 healthy controls. RESULTS: During the working memory task, the control group showed significantly stronger connectivity with areas implicated in the salience and executive networks, including the right inferior frontal gyrus and the right inferior parietal lobule. The PTSD group showed stronger connectivity with areas implicated in the default mode network, namely enhanced connectivity between the posterior cingulate cortex and the right superior frontal gyrus and between the medial prefrontal cortex and the left parahippocampal gyrus. LIMITATIONS: Because we were studying alterations in patients with severe, chronic PTSD, we could not exclude patients taking medication. The small sample size may have limited the power of our analyses. To avoid multiple testing in a small sample, we only used 2 seed regions for our analyses. CONCLUSION: The different patterns of connectivity imply significant group differences with task-induced switches (i.e., engaging and disengaging the default mode network and the central-executive network).
Keywords: Gyrus Cinguli; Parahippocampal Gyrus; Prefrontal Cortex; Parietal Lobe; Nerve Net; Humans; Magnetic Resonance Imaging; Memory, Short-Term; Stress Disorders, Post-Traumatic; Psychiatric Status Rating Scales; Adult; Middle Aged; Female; Male; Executive Function
Rights: © 2010 Canadian Medical Association
RMID: 0020100348
DOI: 10.1503/jpn.090175
Appears in Collections:Psychiatry publications

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