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Enhanced tES and tDCS computational models by meninges emulation.

Jimmy Jiang1,2, Dennis Q Truong1,2,3, Zeinab Esmaeilpour1

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Accurate transcranial electrical stimulation (tES) models are crucial for brain stimulation. This study found that adjusting cerebrospinal fluid (CSF) conductivity in models improves current flow accuracy, enhancing tES research.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Computational Modeling

Background:

  • Accurate computational models of current flow are essential for understanding transcranial electrical stimulation (tES) and optimizing brain interventions.
  • Conventional tES models simplify the skull-brain interface, often modeling it as solely cerebrospinal fluid (CSF), which is anatomically inaccurate.
  • The meninges, located between the skull and brain, have lower conductivity than CSF and significantly influence current distribution.

Purpose of the Study:

  • To improve the accuracy of computational models for tES by accounting for the influence of meningeal layers.
  • To develop a method for emulating the effect of meninges on current flow without requiring high-resolution anatomical models.
  • To establish a new standard for CSF conductivity in tES modeling.

Main Methods:

  • Developed head models with distinct meningeal layers in a concentric sphere model.
  • Optimized CSF conductivity in a simplified model to mimic the electric field alterations caused by meninges.
  • Applied the optimized CSF conductivity to MRI-derived head models for validation.

Main Results:

  • Emulating meningeal effects by adjusting CSF conductivity (0.85 S m-1) resulted in voltage fields better correlated with intracranial recordings compared to conventional CSF conductivity (1.65 S m-1).
  • This approach improved model accuracy without increasing computational complexity.
  • The optimized conductivity showed better correlation with actual brain recordings.

Conclusions:

  • Misrepresenting the skull-brain interface as entirely CSF in tES models leads to inaccuracies.
  • Modifying CSF conductivity to emulate meningeal effects offers a computationally efficient way to enhance tES model accuracy.
  • A recommended emulated CSF conductivity of 0.85 S m-1 can serve as a new standard for non-invasive brain stimulation modeling.