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La C, Nair VA, Mossahebi P, Young BM, Chacon M, Jensen M, Birn RM, Meyerand ME, Prabhakaran V. Implication of the Slow-5 Oscillations in the Disruption of the Default-Mode Network in Healthy Aging and Stroke. Brain Connect 2017; 6:482-95. [PMID: 27130180 DOI: 10.1089/brain.2015.0375] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The processes of normal aging and aging-related pathologies subject the brain to an active re-organization of its brain networks. Among these, the default-mode network (DMN) is consistently implicated with a demonstrated reduction in functional connectivity within the network. However, no clear stipulation on the underlying mechanisms of the de-synchronization has yet been provided. In this study, we examined the spectral distribution of the intrinsic low-frequency oscillations (LFOs) of the DMN sub-networks in populations of young normals, older subjects, and acute and subacute ischemic stroke patients. The DMN sub-networks were derived using a mid-order group independent component analysis with 117 eyes-closed resting-state functional magnetic resonance imaging (rs-fMRI) sessions from volunteers in those population groups, isolating three robust components of the DMN among other resting-state networks. The posterior component of the DMN presented noticeable differences. Measures of amplitude of low-frequency fluctuation (ALFF) and fractional ALFF (fALFF) of the network component demonstrated a decrease in resting-state cortical oscillation power in the elderly (normal and patient), specifically in the slow-5 (0.01-0.027 Hz) range of oscillations. Furthermore, the contribution of the slow-5 oscillations during the resting state was diminished for a greater influence of the slow-4 (0.027-0.073 Hz) oscillations in the subacute stroke group, not only suggesting a vulnerability of the slow-5 oscillations to disruption but also indicating a change in the distribution of the oscillations within the resting-state frequencies. The reduction of network slow-5 fALFF in the posterior DMN component was found to present a potential association with behavioral measures, suggesting a brain-behavior relationship to those oscillations, with this change in behavior potentially resulting from an altered network integrity induced by a weakening of the slow-5 oscillations during the resting state. The repeated identification of those frequencies in the disruption of DMN stresses a critical role of the slow-5 oscillations in network disruption, and it accentuates the importance of managing those oscillations in the health of the DMN.
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Affiliation(s)
- Christian La
- 1 Neuroscience Training Program, University of Wisconsin-Madison , Madison, Wisconsin.,2 Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin
| | - Veena A Nair
- 2 Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin
| | - Pouria Mossahebi
- 2 Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin
| | - Brittany M Young
- 1 Neuroscience Training Program, University of Wisconsin-Madison , Madison, Wisconsin.,2 Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin
| | - Marcus Chacon
- 3 Department of Neurology, University of Wisconsin-Madison , Madison, Wisconsin
| | - Matthew Jensen
- 3 Department of Neurology, University of Wisconsin-Madison , Madison, Wisconsin
| | - Rasmus M Birn
- 1 Neuroscience Training Program, University of Wisconsin-Madison , Madison, Wisconsin.,4 Department of Medical Physics, University of Wisconsin-Madison , Madison, Wisconsin.,5 Department of Psychiatry, University of Wisconsin-Madison , Madison, Wisconsin
| | - Mary E Meyerand
- 1 Neuroscience Training Program, University of Wisconsin-Madison , Madison, Wisconsin.,2 Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin.,4 Department of Medical Physics, University of Wisconsin-Madison , Madison, Wisconsin.,6 Department of Biomedical Engineering, University of Wisconsin-Madison , Madison, Wisconsin
| | - Vivek Prabhakaran
- 1 Neuroscience Training Program, University of Wisconsin-Madison , Madison, Wisconsin.,2 Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin.,3 Department of Neurology, University of Wisconsin-Madison , Madison, Wisconsin.,4 Department of Medical Physics, University of Wisconsin-Madison , Madison, Wisconsin.,5 Department of Psychiatry, University of Wisconsin-Madison , Madison, Wisconsin.,6 Department of Biomedical Engineering, University of Wisconsin-Madison , Madison, Wisconsin
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