Where to see EGI's Neuromodulation

April 13-14, Minnesota Neuromodulation Symposium, Minneapolis, MN, USA

May 18-20, Biological Psychiatric Research using neuromodulation (SOBP), San Diego, CA, USA

NEW! GTEN 100 Research Neuromodulation System

Precise, non-invasive neuromodulation with simultaneous EEG

GTEN 100 tDCS/tACS/tPCS neuromodulation with simultaneous EEG

Built on the Geodesic EEG Platform, the GTEN 100 Research System takes advantage of

  •  dense array EEG technology
  •  advanced source imaging software
  •  realistic high-resolution electric head modeling
  •  sophisticated planning and targeting software

to create the most technically advanced non­invasive neuromodulation system available on the market.

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 The science behind GeoSource 3.0 source imaging and GTEN 100 Neuromodulation

SymposiaOnDemand buttonView EGI's GTEN Symposium presented at OHBM 2016.
See it now with EGI SYMPOSIA OnDemand.


NEW! EGI's new study using GTEN 100 Research System and pulsed protocols showed long-term depression of motor cortex excitability, sustained over 90 minutes following current injection. Read the paper.

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The GTEN 100 Research System is for research use only. This product is intended by the manufacturer for use by research scientists under the supervision of an Institutional Review Board or Ethics Committee.

Geodesic Sensor Net for dense array EEG recordingsFlexible and reliable neuromodulation with simultaneous EEG

Any combination of electrodes can be used for EEG recording or as sources or sinks for

  • transcranial direct current stimulation (tDCS)
  • transcranial alternating current stimulation (tACS)
  • pulsed direct current stimulation (tPCS)

Record EEG concurrently with neuromodulation to evaluate neuromodulatory effects on brain activity.



Electrodes for stimulation can be automatically selected for a defined target region or manually selected to create and evaluate any pattern of sources and sinks, from a simple two-patch pattern to your own design of complex patterns.


Proprietary software and hardware for precise cortical targeting
GTEN 100 targeting and planning software is designed to maximize current delivery dosage to your target while limiting current elsewhere.
    tDCS neuromodulation
  • Planning based on the reciprocity
    principle quickly calculates ideal
    electrode configuration to modulate the cortical target
  • 3D images show predicted negative
    and positive cortical radial current
    density distributions so you can
    evaluate and modify the plan
  • EGI’s AccuCharge Circuit continually
    balances source channels with sink
    channels to maintain the desired current levels over time
  • Protocols can be created with varying durations, waveforms, frequencies, and pulse durations
  • Includes ability to design sham protocols

Realistic head models for better accuracy FDM electrical head model
EGI’s high­ resolution FDM head models are accurate for describing the underlying geometry of the conductive tissues, and also for how current flows through the head volume to the scalp.

  • Uses 7 different tissue types — scalp, skull, cerebrospinal fluid, grey matter, white matter, air, and eyeballs
  • Uses 3D sensor positions to define the path of electrical current form the cortex to the scalp
  • The FDM calculates electric potentials voxel­by­voxel from 1 mm MRI images

Integration withGeoSource 3 electrical source imaging GeoSource 3 Research electrical source imaging software to define target selection

  • Choice of individual head models, atlas head models or conformal/warped atlas head models from MRI data
  • Use source estimation to identify functionally significant positive and negative cortical regions that be used as targets for neuromodulation

Designed with important safety features
Multiple software and hardware controls limit current levels to less than 200 μAmps per electrode or 1 mAmp total.

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GTEN 100 Research neuromodulation system is available as a conversion package to EGI’s Geodesic EEG System (GES) 400.

The complete GTEN Research System requires the purchase of:

GTEN 100 Research Conversion Package, 256 channelGTEN 100 Research Neuromodulation System

  • Net Amps™ 400 amplifier conversion to Net Amps™ GTEN 100 amplifier
  • GTEN targeting and planning software module
  • GTEN control software module

256-­channel Geodesic EEG System 400 with Net Station 5.3 software
Note that the Net Amps 400 amplifier supplied with this system will be converted to the Net Amps GTEN 100 amplifier. The Net Amps GTEN 100 amplifier is FOR RESEARCH USE ONLY.

256-­channel HydroCel Geodesic Sensor Net (GSN) 130 — sponged or LTM

GeoSource 3.0 Research Basic, Intermediate, or Advanced Package

  • Basic includes GeoSource 3.0 software and 1 mm resolution FDM atlas head models
  • Intermediate adds the ability include individual sensor positions to create 1 ­mm resolution FDM conformal atlas head models
  • Advanced adds the ability to import MRI data to create 1­ mm resolution FDM individual head models

Geodesic Photogrammetry System or GeoScan Sensor Digitization Device - ­ for registration of individual sensors to the head model, used in creating a conformal atlas (in GeoSource 3.0 Research Intermediate) or individual head model (in GeoSource 3.0 Research Advanced).

The GTEN 100 Research System is covered by US Pat. No. 6,330,470 and 6,594,521. GeoSource 3.0 Research Packages are covered by US Patent No. 8,478,011. The Geodesic Photogrammetry System is covered by US Patent No. 7,190,826.

AccuCharge, GeoSource, Geodesic EEG, Geodesic Photogrammetry System, GeoScan, GES, GTEN, Geodesic Sensor Net, and Net Station are trademarks of Electrical Geodesics, Inc.