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Dual-Task Performance and Brain Morphologic Characteristics in Parkinson's Disease.

Sarah J Carlson1, Yi-Fang Chiu2, Merrill R Landers3

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Summary

Individuals with Parkinson's disease (PD) who performed better on dual tasks (DTs) had thicker cortices in sensorimotor areas. These brain differences highlight neural correlates of automaticity and dual-tasking in PD.

Keywords:
AttentionCortexDual taskMotor controlNeuroimagingParkinson

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Area of Science:

  • Neuroscience
  • Neurology
  • Radiology

Background:

  • Parkinson's disease (PD) impairs automaticity, affecting dual-task (DT) performance and daily functioning.
  • Understanding the neural basis of DTs in PD is crucial for developing targeted therapies.
  • This study investigated brain morphologic differences associated with varying DT performance in individuals with PD.

Purpose of the Study:

  • To explore the relationship between brain morphology and dual-task (DT) performance in individuals with Parkinson's disease (PD).
  • To identify specific cortical and subcortical volumetric differences between low and high DT performers with PD.

Main Methods:

  • Volumetric MRI was used to obtain cortical thickness and subcortical volumes from 34 individuals with PD and 47 healthy older adults.
  • Participants were categorized into low or high DT performers based on their performance on a DT-timed-up-and-go test with a serial subtraction task.
  • Statistical analyses included nonparametric testing (Quade's ANCOVA) and hierarchical linear regression, controlling for relevant covariates.

Main Results:

  • Individuals with PD who were high DT performers exhibited thicker cortices in the right primary somatosensory cortex, bilateral primary motor cortices, and bilateral supplementary motor areas compared to low DT performers.
  • Left primary cortex, left prefrontal cortex, and right supplementary motor area thickness also differed significantly when a healthy comparison group was included.
  • Left paracentral lobule thickness was a significant predictor, explaining 20.8% of the variability in combined DT effect.

Conclusions:

  • Higher dual-task (DT) performance in Parkinson's disease (PD) is associated with distinct cortical morphologic characteristics, particularly in sensorimotor regions.
  • These findings suggest that enhanced DT ability in PD relies on a convergence of neural control involving sensorimotor integration, motor planning, and motor activation.
  • The study identifies specific brain regions that may be targeted for therapeutic interventions aimed at improving automaticity and dual-tasking in PD.