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Electric Field Model of Transcranial Electric Stimulation in Nonhuman Primates: Correspondence to Individual Motor Threshold.

Publication ,  Journal Article
Lee, WH; Lisanby, SH; Laine, AF; Peterchev, AV
Published in: IEEE Trans Biomed Eng
September 2015

OBJECTIVE: To develop a pipeline for realistic head models of nonhuman primates (NHPs) for simulations of noninvasive brain stimulation, and use these models together with empirical threshold measurements to demonstrate that the models capture individual anatomical variability. METHODS: Based on structural MRI data, we created models of the electric field (E-field) induced by right unilateral (RUL) electroconvulsive therapy (ECT) in four rhesus macaques. Individual motor threshold (MT) was measured with transcranial electric stimulation (TES) administered through the RUL electrodes in the same subjects. RESULTS: The interindividual anatomical differences resulted in 57% variation in median E-field strength in the brain at fixed stimulus current amplitude. Individualization of the stimulus current by MT reduced the E-field variation in the target motor area by 27%. There was significant correlation between the measured MT and the ratio of simulated electrode current and E-field strength (r(2) = 0.95, p = 0.026). Exploratory analysis revealed significant correlations of this ratio with anatomical parameters including of the superior electrode-to-cortex distance, vertex-to-cortex distance, and brain volume (r(2) > 0.96, p < 0.02). The neural activation threshold was estimated to be 0.45 ±0.07 V/cm for 0.2-ms stimulus pulse width. CONCLUSION: These results suggest that our individual-specific NHP E-field models appropriately capture individual anatomical variability relevant to the dosing of TES/ECT. These findings are exploratory due to the small number of subjects. SIGNIFICANCE: This study can contribute insight in NHP studies of ECT and other brain stimulation interventions, help link the results to clinical studies, and ultimately lead to more rational brain stimulation dosing paradigms.

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Published In

IEEE Trans Biomed Eng

DOI

EISSN

1558-2531

Publication Date

September 2015

Volume

62

Issue

9

Start / End Page

2095 / 2105

Location

United States

Related Subject Headings

  • Transcranial Direct Current Stimulation
  • Models, Neurological
  • Male
  • Magnetic Resonance Imaging
  • Macaca mulatta
  • Finite Element Analysis
  • Electricity
  • Brain
  • Biomedical Engineering
  • Animals
 

Citation

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Lee, W. H., Lisanby, S. H., Laine, A. F., & Peterchev, A. V. (2015). Electric Field Model of Transcranial Electric Stimulation in Nonhuman Primates: Correspondence to Individual Motor Threshold. IEEE Trans Biomed Eng, 62(9), 2095–2105. https://doi.org/10.1109/TBME.2015.2425406
Lee, Won Hee, Sarah H. Lisanby, Andrew F. Laine, and Angel V. Peterchev. “Electric Field Model of Transcranial Electric Stimulation in Nonhuman Primates: Correspondence to Individual Motor Threshold.IEEE Trans Biomed Eng 62, no. 9 (September 2015): 2095–2105. https://doi.org/10.1109/TBME.2015.2425406.
Lee WH, Lisanby SH, Laine AF, Peterchev AV. Electric Field Model of Transcranial Electric Stimulation in Nonhuman Primates: Correspondence to Individual Motor Threshold. IEEE Trans Biomed Eng. 2015 Sep;62(9):2095–105.
Lee, Won Hee, et al. “Electric Field Model of Transcranial Electric Stimulation in Nonhuman Primates: Correspondence to Individual Motor Threshold.IEEE Trans Biomed Eng, vol. 62, no. 9, Sept. 2015, pp. 2095–105. Pubmed, doi:10.1109/TBME.2015.2425406.
Lee WH, Lisanby SH, Laine AF, Peterchev AV. Electric Field Model of Transcranial Electric Stimulation in Nonhuman Primates: Correspondence to Individual Motor Threshold. IEEE Trans Biomed Eng. 2015 Sep;62(9):2095–2105.

Published In

IEEE Trans Biomed Eng

DOI

EISSN

1558-2531

Publication Date

September 2015

Volume

62

Issue

9

Start / End Page

2095 / 2105

Location

United States

Related Subject Headings

  • Transcranial Direct Current Stimulation
  • Models, Neurological
  • Male
  • Magnetic Resonance Imaging
  • Macaca mulatta
  • Finite Element Analysis
  • Electricity
  • Brain
  • Biomedical Engineering
  • Animals