1 / 16

Prefrontal Cortex transcranial Direct Current Stimulation via a Combined High Definition and Conventional Electrode Mo

Prefrontal Cortex transcranial Direct Current Stimulation via a Combined High Definition and Conventional Electrode Montage: A FEM modeling study. Dennis Q. Truong, Abhishek Datta , Jiansong Xu , Felipe Fregni , and Marom Bikson Neural Engineering Laboratory

datherine
Télécharger la présentation

Prefrontal Cortex transcranial Direct Current Stimulation via a Combined High Definition and Conventional Electrode Mo

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Prefrontal Cortex transcranial Direct Current Stimulation via a Combined High Definition and Conventional Electrode Montage: A FEM modeling study Dennis Q. Truong, AbhishekDatta, JiansongXu, Felipe Fregni, and MaromBikson Neural Engineering Laboratory Department of Biomedical Engineering, City College of the City University of New York, NY *Research supported by The Wallace Coulter Foundation

  2. tDCS Basics • Typicallysubthreshold brain stimulation • Action potentials are not directly caused, rather excitability is enhanced or suppressed • Enhanced or Suppressed cortical excitability is due to polarity.

  3. Heuristic Montages • Traditionally montages have been created by “rule of thumb” • Active Pad over a target region.

  4. Heuristic Montages • Traditionally montages have been created by “rule of thumb” • Active Pad over a target region. M1

  5. Heuristic Montages • Traditionally montages have been created by “rule of thumb” • Active Pad over a target region. Broca’s

  6. Heuristic Montages • Traditionally montages have been created by “rule of thumb” • Active Pad over a target region. Wernicke’s

  7. Heuristic Montages • Traditionally montages have been created by “rule of thumb” • Active Pad over a target region. Dorsal Lateral Prefronal Cortex (F8)

  8. Heuristic Montages • Traditionally montages have been created by “rule of thumb” • Active Pad over a target region. • Return Pad is simply elsewhere. F8 - SO

  9. tDCS is Polarity Sensitive • Both the “Active” and “Return” stimulate (enhanced or suppressed excitability)

  10. An Alternative to ContralateralSupraorbital • Both the “Active” and “Return” stimulate (enhanced or suppressed excitability) “2x1” Hybrid

  11. The Finite Element Model

  12. Heuristic Design is Limited • The location of the return pad effects current distribution.

  13. Stimulation “over” is not Stimulation “of” • Peak Electric field may or may not be on be directly under the active electrodes

  14. Stimulation “over” is not Stimulation “of” • Peak Electric field may or may not be on be directly under the active electrodes

  15. Summary • Montage design does not obey a simple rule of thumb. • Active Electrodes do not necessarily cause peak field at the target. • Return Electrodes need to be carefully considered. • Big Picture: Clinicians could use better guidelines for montage designs. i.e. – database of montage models

  16. Future Work

More Related