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Behavioral Reserve in Behavioral Variant Frontotemporal Dementia.

Su Hong Kim1,2, Yae Ji Kim2,3, Byung Hwa Lee4,5,6

  • 1Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.

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Summary

Behavioral reserve (BR) in behavioral variant frontotemporal dementia (bvFTD) may predict disease progression. Higher neural integrity and specific network patterns were observed in individuals with greater negative symptom reserve (nBR).

Keywords:
MRIbehavior reservebehavioral variant frontotemporal dementiabrain networkneural correlates

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Area of Science:

  • Neuroscience
  • Neurology

Background:

  • Behavioral reserve (BR) describes individual differences in response to neuropathological burden.
  • Behavioral variant frontotemporal dementia (bvFTD) is characterized by significant behavioral changes.

Purpose of the Study:

  • To explore behavioral reserve (BR) and its neural correlates in bvFTD.
  • To develop a marker for negative symptom reserve (nBR) and investigate its relationship with disease progression.

Main Methods:

  • Assessed 40 bvFTD participants using the frontal behavioral inventory (FBI) and magnetic resonance imaging (MRI).
  • Developed a linear model to calculate nBR using neuroimaging abnormalities and FBI negative symptom scores.
  • Compared high nBR and low nBR groups based on neuroimaging and clinical data.

Main Results:

  • Neuroimaging abnormalities correlated negatively with FBI negative symptom scores.
  • High nBR group showed lower FBI negative symptoms, steeper cortical atrophy decline, and less left frontotemporal atrophy.
  • Higher fractional anisotropy (FA) values were found in the high nBR group in most brain regions.
  • Identified an nBR-related functional network involving frontotemporal and left occipital areas.

Conclusions:

  • Proposed the concept of behavioral reserve (BR) in bvFTD.
  • Findings suggest nBR can help predict disease progression in bvFTD.
  • Neural network characteristics and atrophy patterns are associated with nBR in bvFTD.