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Articles, Development/Plasticity/Repair

Accelerated Changes in White Matter Microstructure during Aging: A Longitudinal Diffusion Tensor Imaging Study

Claire E. Sexton, Kristine B. Walhovd, Andreas B. Storsve, Christian K. Tamnes, Lars T. Westlye, Heidi Johansen-Berg and Anders M. Fjell
Journal of Neuroscience 12 November 2014, 34 (46) 15425-15436; DOI: https://doi.org/10.1523/JNEUROSCI.0203-14.2014
Claire E. Sexton
1FMRIB Centre, Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, OX3 9DU, United Kingdom,
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Kristine B. Walhovd
2Research Group for Lifespan Changes in Brain and Cognition, Department of Psychology, University of Oslo, NO-0316 Oslo, Norway,
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Andreas B. Storsve
2Research Group for Lifespan Changes in Brain and Cognition, Department of Psychology, University of Oslo, NO-0316 Oslo, Norway,
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Christian K. Tamnes
2Research Group for Lifespan Changes in Brain and Cognition, Department of Psychology, University of Oslo, NO-0316 Oslo, Norway,
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Lars T. Westlye
3K.G. Jebsen Center for Psychosis Research, Norwegian Center for Mental Disorders Research, Division of Mental Health and Addiction, Oslo University Hospital, NO-0316 Oslo, Norway, and
4Department of Psychology, University of Oslo, NO-0316 Oslo, Norway
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Heidi Johansen-Berg
1FMRIB Centre, Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, OX3 9DU, United Kingdom,
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Anders M. Fjell
2Research Group for Lifespan Changes in Brain and Cognition, Department of Psychology, University of Oslo, NO-0316 Oslo, Norway,
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Abstract

It is well established that human brain white matter structure changes with aging, but the timescale and spatial distribution of this change remain uncertain. Cross-sectional diffusion tensor imaging (DTI) studies indicate that, after a period of relative stability during adulthood, there is an accelerated decline in anisotropy and increase in diffusivity values during senescence; and, spatially, results have been discussed within the context of several anatomical frameworks. However, inferring trajectories of change from cross-sectional data can be challenging; and, as yet, there have been no longitudinal reports of the timescale and spatial distribution of age-related white matter change in healthy adults across the adult lifespan. In a longitudinal DTI study of 203 adults between 20 and 84 years of age, we used tract-based spatial statistics to characterize the pattern of annual change in fractional anisotropy, axial diffusivity, radial diffusivity, and mean diffusivity and examined whether there was an acceleration of change with age. We found extensive and overlapping significant annual decreases in fractional anisotropy, and increases in axial diffusivity, radial diffusivity, and mean diffusivity. Spatially, results were consistent with inferior-to-superior gradients of lesser-to-greater vulnerability. Annual change increased with age, particularly within superior regions, with age-related decline estimated to begin in the fifth decade. Charting white matter microstructural changes in healthy aging provides essential context to clinical studies, and future studies should compare age trajectories between healthy participants and at-risk populations and also explore the relationship between DTI rates of change and cognitive decline.

  • aging
  • DTI
  • lifespan
  • longitudinal
  • white matter
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The Journal of Neuroscience: 34 (46)
Journal of Neuroscience
Vol. 34, Issue 46
12 Nov 2014
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Accelerated Changes in White Matter Microstructure during Aging: A Longitudinal Diffusion Tensor Imaging Study
Claire E. Sexton, Kristine B. Walhovd, Andreas B. Storsve, Christian K. Tamnes, Lars T. Westlye, Heidi Johansen-Berg, Anders M. Fjell
Journal of Neuroscience 12 November 2014, 34 (46) 15425-15436; DOI: 10.1523/JNEUROSCI.0203-14.2014

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Accelerated Changes in White Matter Microstructure during Aging: A Longitudinal Diffusion Tensor Imaging Study
Claire E. Sexton, Kristine B. Walhovd, Andreas B. Storsve, Christian K. Tamnes, Lars T. Westlye, Heidi Johansen-Berg, Anders M. Fjell
Journal of Neuroscience 12 November 2014, 34 (46) 15425-15436; DOI: 10.1523/JNEUROSCI.0203-14.2014
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Keywords

  • aging
  • DTI
  • lifespan
  • longitudinal
  • white matter

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