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Functional brain imaging of walking while talking - An fNIRS study.

Florian G Metzger1, Ann-Christine Ehlis2, Florian B Haeussinger2

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Functional near-infrared spectroscopy (fNIRS) effectively measures brain activity during whole-body movements, unlike fMRI. This study shows fNIRS maps cortical activation across fronto-temporo-parietal areas during walking and cognitive tasks.

Keywords:
dual taskfunctional near-infrared spectroscopygaitgait imagingverbal fluency task

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Biomedical Engineering

Background:

  • Functional magnetic resonance imaging (fMRI) is limited for whole-body movement studies.
  • Previous functional near-infrared spectroscopy (fNIRS) studies focused mainly on prefrontal cortex during movement.
  • Assessing complex motor tasks requires broader cortical coverage than typically achieved.

Purpose of the Study:

  • To present in vivo functional near-infrared spectroscopy (fNIRS) as a viable method for studying whole-body movement effects on cortical activation.
  • To investigate fronto-temporo-parietal cortical activation during single- and dual-task walking paradigms.
  • To compare brain activation patterns between different walking speeds and combined cognitive-motor tasks.

Main Methods:

  • Utilized functional near-infrared spectroscopy (fNIRS) with extensive probe coverage (two 4x4 sets, 24 channels each).
  • Measured brain activation in 12 healthy young adults performing treadmill walking at 3 km/h and 5 km/h (single-task).
  • Assessed dual-task performance combining walking (3 km/h) with a verbal fluency task (VFT).

Main Results:

  • Observed increased activation in Broca's area and the corresponding right hemisphere area under more demanding conditions (faster walking, dual-task).
  • Demonstrated widespread fronto-temporo-parietal cortical activation during dual-task paradigms involving gait and cognitive load.
  • Highlighted the need for extensive fNIRS coverage to fully analyze these complex activation patterns.

Conclusions:

  • Functional near-infrared spectroscopy (fNIRS) is a suitable in vivo technique for assessing cortical activation during whole-body movements.
  • Dual-task paradigms combining gait and cognitive tasks elicit broad cortical engagement across multiple brain regions.
  • Comprehensive fNIRS assessments are necessary to understand the neural underpinnings of complex motor-cognitive interactions.