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Geodesic EEG System 250

 


ges250r  mindbender  subject/passenger  neemo netcam
  On a Mindbender 60 Feet under the Sea


The GES 250 for Dense-Array EEG Research

Robust performance. Extraordinary durability.
The system that's been almost everywhere.

  • Superior hardware filter control.
  • Fast application of 64, 128, or 256 electrodes, with no scalp abrasion required.
  • Easy EEG recording of newborns through adults—no sedation needed.
  • Flexible recording options with two HydroCel electrolyte formulations for 2- or 12-hour recordings.
  • Turbo-charged with a dual-processor PowerMac G5 and the ultra-crisp Apple Cinema Display HD.
  • Full-featured Net Station 4.2 acquisition, review, and analysis software with digital video included.
  • Fully supported upgrade path to higher channel counts.
  • Most widely published dense-array EEG system, worldwide.

Each Geodesic EEG System 250 includes: 3 HydroCel Geodesic Sensor Nets, a Net Amps 200 amplifier, Apple PowerMac G5, Net Station 4.2 software, 23-inch Apple Cinema Display, and digital video camera.

Full details about the research features of the Mac-based GES 250 are listed in a two-page product flier, available here as a medium-resolution (256KB) PDF. For system highlights, read on.

HydroCel GSN

HydroCel Geodesic Sensor Net®

  • Low-profile pedestals for greater comfort.
  • Carbon-fiber electrodes coated with a tough silver-chloride surface to block out electrochemical noise.
  • Teflon-core coaxial electrode wires to minimize triboelectric noise and the pickup of environmental electromagnetic noise.
  • A unique pedestal design that creates a sealed micro-environment, hydrating the skin and interfacing it with the electrode surface.
  • Captures critical information from the inferior surface of the brain.
  • Nets have rapid application, are reusable, and have low maintenance.
  • No scalp abrasion yields minimal infection risk, painless EEG.

Net Station 4.2

Net Station 4.2 is compatible with both Apple's PowerPC and Intel processors. Apple has not announced the release of its Intel-based desktop computer; when MacTel computers are available, they will be standard with our EEG systems.

Acquisition

  • Fast Fourier Transform (FFT) Workbench device for near-real-time display of spectral data.
  • Photic-stimulator Workbench device for interfacing with the ATES PH80 photic stimulator.
  • Digital-video Workbench device for synchronized images with FireWire cameras.

Review

  • Offline display of FFT data using a combination of Net Station's preset frequency bands (average, delta, theta, alpha, and beta) or as many as six user-definable bands.
  • FFT data display in Net Station's Grid, Topo Plot, or Topo Map views with a user-definable time window.
  • JTF data display in Net Station's Grid and Topo Plot views.
  • Synchronized digital video and EEG playback.

For more general information, visit the Net Station page.

 

JTF Topo Plot view

Analysis

  • Joint Time-Frequency (JTF) wavelet transform to examine frequency information over time.
  • Gratton, Coles, and Donchin method for removing eye-blink artifacts from EEG data.
  • T-test for single- or multiple-subject files; compares two conditions by row or column and outputs a text file containing t-values for each channel and timepoint.
top of page

 

 

Net Amps 200

Net Amps 200

  • Acquisition: 64 or 128 EEG channels; 256 channels available by arraying amplifiers.
  • AC coupling.
  • 16-bit A/D converter.
  • Input impedance: 200 MΩ.
  • Sampling rate: up to 1,000 Hz for 256 channels.
  • Amplifier noise: 0.6 µV RMS (typical).
  • Dynamic range: ±2.5 mV.
  • Precision: 0.076 µV.
  • Choice of Bessel or elliptical lowpass filters from 0 to 400 Hz.
  • Time constant: 9 seconds with 0.01 Hz filter; 1 second with 0.1 Hz filter.
  • Common mode rejection: 90 dB.
  • Isolation mode rejection: 120 dB.

For more general information, visit the Net Amps 200 page.

Computer/Cart

(minimum system specifications)

  • Apple Dual 2 GHz PowerPC G5, 1.5 GB RAM, 160 GB hard drive, 16x SuperDrive, Mac OS X.
  • 23" Apple Cinema Display (upgradeable to 30").
  • Elegant cart, conveniently outfitted for use with the HydroCel Geodesic Sensor Net.
  
Support and Training

Support and Training

System purchase includes:

  • On-site installation and training visit.
  • System manuals and EEG/ERP Analysis Tutorial.
  • 1-year phone and email support.
  • 2 tuition waivers to EGI Summer School or other EGI workshops.

Upgradable

Geodesic EEG Systems are designed so you can select precisely the features you need today. That means that you don’t have to pay for functions you don’t use. The GES 250 supports upgrades to all functions and all channel counts, so you can easily configure your system to accommodate your changing needs.

 

 
 
©2008 Electrical Geodesics, Inc.