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Related Experiment Video

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Neuronavigated Focalized Transcranial Direct Current Stimulation Administered During Functional Magnetic Resonance Imaging
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Transcranial direct current stimulation modulates activation and effective connectivity during spatial navigation.

Benjamin M Hampstead1, Gregory S Brown2, Justin F Hartley3

  • 1Rehabilitation R&D Center of Excellence, Atlanta VAMC, Decatur, GA, USA; Department of Rehabilitation Medicine, Emory University, Atlanta, GA, USA.

Brain Stimulation
|January 30, 2014
PubMed
Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) can alter brain activity to improve spatial navigation. This study shows tDCS can modulate brain networks, offering potential to treat age-related navigation decline.

Keywords:
AllocentricGranger causality analysisHippocampusLearningMemoryfMRItDCS

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Spatial navigation declines with age and neurologic disease, linked to changes in parietal cortex and hippocampus, not the caudate nucleus.
  • Transcranial direct current stimulation (tDCS) can modulate brain excitability, showing promise for treating navigation deficits.

Purpose of the Study:

  • Validate a novel spatial navigation paradigm using fMRI in healthy young adults.
  • Determine if tDCS modulates brain activation and effective connectivity in a polarity-specific manner for navigation.

Main Methods:

  • Participants underwent fMRI while learning allocentric and egocentric environments.
  • Study 2 involved 16 participants randomized to tDCS (2 mA, 20 min) with an anodal montage over the parietal cortex (PZ) and cathode over the frontal cortex (AF4) (P+F-) or vice versa (P-F+).

Main Results:

  • Distinct neural networks were identified for allocentric and egocentric navigation.
  • The P+F- tDCS montage enhanced activation and connectivity in spatial regions (parietal cortex, hippocampus) and the caudate nucleus, particularly during allocentric navigation.
  • The P-F+ montage increased activation and connectivity in lateral prefrontal cortices and the posterior hippocampus.

Conclusions:

  • Findings support tDCS's neuromodulatory effects in non-motor brain regions.
  • Demonstrates proof-of-principle for tDCS in ameliorating navigation decline associated with aging and disease.