g.HIamp-RESEARCH: Specs & Features

Groundbreaking technology for brain mapping

High demands require high level solutions and groundbreaking technology. g.HIamp-RESEARCH is a 256 channel biosignal amplifier for non-invasive measurements of brain functions for research purpose only. The amplifier, which is colored in orange, has 256 ADC converters with 24 Bit inside for perfect signal resolution and has a wide input sensitivity to measure EEG, ECG, EMG, EOG without any saturation. External sensors can also be connected. All channels are DC coupled. Internally, signal processing is performed with the fastest floating point DSP and a sophisticated Linux Kernel. The amplifier relies on a very high oversampling to reduce the noise as much as possible by averaging samples.

256 channels can be analyzed in real-time with the g.tec Highspeed Processing for Simulink toolbox. This leads to faster and more accurate control of brain-computer interface systems. The system is equipped with 16 digital trigger channels and a HOLD input for artifact suppression. 80 and 144 channel systems can also be upgraded later on. Each block of 64 channels is connected via a multi-pole safety connector to the electrode interface box.  A big advantage is that g.HIamp-RESEARCH can be used with passive or active electrodes. The difference is just the electrode connector box (headbox).

g.HIamp-RESEARCH is intended to be used for research applications only. It is not intended to be used as a medical device nor for diagnosis, treatment of disease or other medical applications. The features of the device are freely accessible and configurable.

Intro offers for g.HIamp-RESEARCH bundles in Austria/Germany (excl. tax): 

Product Highlights

  • 256 channels perfectly synchronized with 24 Bit
  • Supports active and passive EEG electrodes
  • Fully integrated into g.tec software components for real-time analysis 
  • Integrated impedance measurement for active and passive electrodes
  • Used for research applications only
  • TMS compatible

MORE PRODUCT DETAILS

INPUT CHANNEL PROPERTIES

g.HIamp-RESEARCH uses wide-range DC-coupled amplifier technology in combination with 24-bit sampling. The result is an input voltage of +/- 250 mV with a resolution of <60nV! This means that every electrophysiological signal can be recorded directly without additional hardware. Neither high electrode offset voltage nor large artifacts resulting from electrical or magnetic stimulation will saturate the amplifier inputs. This feature is important for various artifact treatment and correction algorithms. The use of digital filters avoids hardware related variations between channels.

ACCURACY AND DATA QUALITY

The amplifier drives each ADC at 614,4 kHz, which is much higher than the required sampling frequency. Then the floating point DSP internally performs the oversampling and averages samples to increase the signal-to-noise ratio. For example, if the amplifier operates at 256 Hz, then 2400 samples are averaged per data point, which suppresses the noise by a factor of 49. In addition, the floating point DSP also performs real-time bandpass filtering and notch filtering of the data. Several hundred different bandpass filters are predefined. Also, bipolar derivations can be calculated by the DSP to work with a very high CMRR.
The amplifier uses 256 ADC for the 256 channels, and hence all signals are sampled exactly at the same time point to avoid any time delay between channels. This is especially important for brain mapping procedures.

ADD MORE CHANNELS

g.HIamp-RESEARCH can be ordered with 64+16, 128+16 or 256 channels initially. The 64+16 channel version comes with one 64 and one 16 channel connector box. The 128+16 version comes with two 64 channel and one 16 channel connector box and the 256 channel version comes with four 64 channel boxes. Later on, if more channels are required, the amplifier can be upgraded by adding more amplifier channels. This makes it easy to start with an inexpensive system.

SKIN-ELECTRODE IMPEDANCE

g.HIamp-RESEARCH uses a new principle for impedance measurement that can determine the skin-electrode impedance for passive and also for active electrodes. It works also for gel or dry electrodes provided by g.tec. The impedance values are color coded, and all 256 channels are shown in one window, which is updated every few seconds! The impedance check can also beep if an electrode was successfully mounted. This allows very fast assembly of electrodes during real-time impedance control. 

SOFTWARE OPTIONS

g.tec's philosophy is to provide a broad spectrum of software solutions for different groups of users (e.g. for engineers, researchers & scientists, physiologists, and medical staff, but also for software developers & programmers). From comfortable Windows-based recording software to MATLAB/Simulink based tools and device drivers and APIs, you will find the appropriate tools for your application. Please see the list of related products/software below for more details. g.HIamp-RESEARCH is also supported and integrated into the main core of BCI2000.

IMPORTANT INFORMATION

We give a full 5-year warranty on g.HIamp-RESEARCH. 


CONNECT ACTIVE/PASSIVE ELECTRODES

A brilliant feature of the g.HIamp-RESEARCH is that the main amplifier unit can be used with different electrode connector boxes. Therefore, the main amplifier unit is only purchased once and can be used for many different applications:

  • passive electrode connector box - comes with 64 channels and is connected to one of the 4 groups of the g.HIamp. It can be used with standard 1.5 mm safety connectors, which are standard for EEG electrodes.
  • active electrode connector box - comes with 64 channels and is connected to one of the 4 groups of the g.HIamp. It has 2-pin connectors to support all g.tec active electrodes, such as g.LADYbird or g.SCARABEO (not for medical use)
  • passive electrode connector box with 16 channels - comes with 16 channels and is connected to one of the 4 groups of the g.HIamp-RESEARCH . This connector box can provide additional inputs for external sensors.


EEG RECORDING DURING TMS STIMULATION

This figure shows EEG recordings with the g.HIamp during TMS stimulation with a TMS device from Mag&More. A g.GAMMAcap (size M) was prepared with passive g.LADYbird electrodes and the sampling rate was set to 38.400 Hz and no filters were selected. All electrode locations were prepared with abrasive gel to get a low electrode impedance. The TMS stimulation was done with a biphasic single pulse and about 300 repetitions applied with 1.1 Hz. The figure shows also the position of the TMS coil.

Beside g.HIamp, TMS can also be used with g.USBamp and g.Nautilus-PRO. The stimulation artifact with passive electrodes is typically 2 ms long, for active electrodes it is around 6 ms.

As a result of the strong electromagnetic field, transcranial magnetic stimulation (TMS) can cause large discharge artifacts in the EEG due to amplifier characteristics and skin/electrode capacitance/impedance. Therefore, g.tec has developed two remedies for this issue: a dedicated TMS headbox for g.HIamp that minimizes the amplifier-related artifact, and a post-processing artifact removal algorithm integrated in g.BSanalyze software that robustly eliminates discharge artifacts in already contaminated data within seconds.
This figure shows an EEG recording while TMS is performed. The brain signals have been recorded with the new TMS headbox and processed via the articat removal algorithm of g.BSanalyze. This twofold approach, combined with the high dynamic range of g.HIamp, restores the entire EEG data after the stimulation and recovers its physiological content on a µV-scale.

Plugin for DEWESoft X

This plugin allows you to acquire data with g.HIamp-RESEARCH inside the DEWESoft data acquisition system and store it together with all other signals acquired from additional devices in one DEWESoft data file.

Further the plugin allows to configure the g.HIamp-RESEARCH and to use its impedance measurement tool.

See also www.dewesoft.com


Available configurations

Complete Solutions

product no.: 8018R read more g.HIamp-RESEARCH 80ch bundle — bundle offer consisting of: g.HIamp-RESEARCH 80, g.Power - g.HIamp, g.HEADbox - passive, g.HEADbox - active, g.HEADbox16 - passive, g.SCARABEO 64 bundle, g.Recorder, trigger cable for g.HIamp
product no.: 8017R read more g.HIamp-RESEARCH 144ch bundle — bundle offer consisting of: g.HIamp-RESEARCH 144, g.Power - g.HIamp, g.HEADbox - passive, 2x g.HEADbox - active, g.HEADbox16 - passive, g.SCARABEO 128 bundle, g.Recorder, trigger cable for g.HIamp
product no.: 8016R read more g.HIamp-RESEARCH 256ch bundle — bundle offer consisting of: g.HIamp-RESEARCH 256, g.Power - g.HIamp, g.HEADbox - passive, 4x g.HEADbox - active, g.HEADbox16 - passive, g.SCARABEO 256 bundle, g.Recorder, trigger cable for g.HIamp
product no.: 8006 read more g.HIamp package BCI — upgrade for BCI research consisting of: g.HIamp SIMULINK HIGH-SPEED ONLINE Processing; g.HIamp P300 + Ping Pong + SSVEP model; g.HIamp common spatial patterns; g.RTanalyze; g.BSanalyze (Base + EEG + Classify)
product no.: 8020 read more g.HIamp AEP Setup — complete setup for auditory stimulation experiments with g.HIamp; consisting of: ASSR, BAEP, AEP stimulation unit; audio trigger cable for g.HIamp; Lecture 4: Evoked potentials; bundle offer (0150, 7240_2, 4053)

See some related products

Hardware and Accessories

product no.: 7282 read more g.HIamp USB cable — connection of g.HIamp to USB-port of PC/notebook
product no.: 7225 read more g.HIamp cable for short-cut function (HOLD) — 3m cable with 3pin screw terminal
product no.: 7240_2 read more audio trigger cable for g.HIamp — DIG IN 1 of g.HIamp HA-xxxx.xx.xx to mindBEAGLE audio trigger box
product no.: 7276A read more trigger cable for g.HIamp for DIG IN 1 — trigger cable for g.HIamp for DIG IN 1 (8 digital lines from DIG IN 1 g.HIamp HA-xxxx.xx.xx to D_Sub 25 male (PC-parallel-port pinout), 3 m)
product no.: 7276B read more trigger cable for g.HIamp for DIG IN 2 — trigger cable for g.HIamp for DIG IN 1 (8 digital lines from DIG IN 2 g.HIamp HA-xxxx.xx.xx to D_Sub 25 male (PC-parallel-port pinout), 3 m)
product no.: 7051 read more g.HIamp water-proof heavy duty case — water-proof heavy duty case for g.HIamp equipment
product no.: 7004 read more g.Power - g.HIamp — medical grade-PSU (power supply unit) for g.Hiamp; 110/230 V; 50/60 Hz power line; single 5 V supply
product no.: 7005 read more g.HEADbox - active — electrode interface box for 64 active channels, for usage with g.HIamp; works with g.tec 2 pin safety connector active electrodes; g.INTERfaceHEADbox2HIamp (7008); g.HEADboxPOWER (7009)
product no.: 7006A read more g.HEADbox - passive — electrode interface box for 64 passive channels, for usage with g.HIamp; works with 1.5 mm medical safety connector passive electrodes; g.INTERfaceHEADbox2HIamp (7008)
product no.: 7006T read more g.HEADbox - TMS — 64 channel electrode connector box for EEG recordings with TMS stimulation
product no.: 7006B read more g.HEADbox - passive — electrode interface box for 64 passive channels, for usage with g.HIamp or g.USBamp for synchronized recordings of g.tec systems and clinical systems; works with 1.5 mm medical safety connector passive electrodes; 2 grounds; g.INTERfaceHEADbox2HIamp (7008)
product no.: 7007 read more g.HEADbox16 - passive — electrode interface box for 16 passive channels, for usage with g.HIamp; works with 1.5 mm medical safety connector electrodes
product no.: 7008 read more g.INTERfaceHEADbox2HIamp — interface cable g.HEADbox to g.HIamp with multi pole connector; approx. 165 cm lead
product no.: 7008S read more g.INTERfaceHEADbox2HIamp, short version — interface cable g.HEADbox to g.HIamp with mulit pole connector, approx. 50 cm lead
product no.: 7009 read more g.HEADboxPOWER — power supply cable for g.HEADbox; approx. 165 cm lead
product no.: 7277 read more adapter cable for trigger cable — DSUB25 female to 8xBNC (including 8xBNC to CINCH adapter)
product no.: 0274d read more g.TRIGbox for g.HIamp — 3 x 4 trigger inputs for analog, optical and digital trigger signals; adjustable thresholds; 1 x analog encoded output; cable for 3 x trigger output included
product no.: 0268a read more g.Power - for g.TRIGbox — medical mains power supply for g.TRIGbox; 110/230 V; 50/60 Hz power line; single 9 V supply
product no.: 0269 read more g.TRIGbox, push-button — bounce-free, to record subject responses, 1.8m cable
product no.: 0271 read more g.TRIGbox, microphone — to trigger on acoustic events, 1.8 m cable
product no.: 0270 read more g.TRIGbox, optical trigger sensor — for screen marker or strobe lamp detection, 1.8 m cable

Software

product no.: 0111 read more g.RTanalyze: Specs & Features — real-time biosignal processing blockset under SIMULINK; real-time algorithms
product no.: 7263 read more g.HIamp C API — driver software package for g.HIamp; full access to recording buffer; for user specific applications on the PC; sophisticated data acquisition and processing software almost under any programming language
product no.: 7263a read more g.HIamp C API + BCI2000 — application programming interface (API) for the user specific application (eg. developed in C/C++); BCI2000 driver; BCI2000 software package
product no.: 0139d read more g.HIamp P300 model — 8-channel P300 based speller
product no.: 0140d read more g.HIamp Ping Pong model — 2 subject and 4-channel motor imagery based game; prerequisite: SIMULINK HIGH-SPEED ONLINE Processing (0260d)
product no.: 0260d read more Highspeed Online Processing Under Simulink for g.HIamp — SIMULINK driver and blockset modules; data processing with maximum system speed
read more g.NEEDaccess — network enabled easy data access
product no.: 6305 read more g.NEEDaccess API — g.tec general device data access interface; application programming interface
product no.: 0311 read more g.DISTRIBUTEDeeg — allows you to record biosignal data from different distributed PCs (DataPCs) in the network and transmit the recorded data to a central evaluation / data storage PC (EvalPC).
product no.: 0167d read more g.Recorder for g.HIamp — fully GUI-based (graphical user interface); comfortable biosignal visualization and storage; full control of the amplifier and header
product no.: 0167EXT read more g.Recorder Extension Pack — additional features for g.Recorder: real-time EP (evoked potential) visualization, video recording, data viewer mode, feature analysis: HR, HRV, CSA, CFM

Electrodes and Sensors

read more g.Electrodes: Specs & Features — various active and passive electrodes for electrophysiological recordings
read more g.Sensors: Specs & Features — various sensors for physiological and physical signals
read more g.GAMMAsys: Specs & Features — active electrode system for EEG/EMG/EOG/ECG
read more g.SAHARA: Specs & Features — active dry EEG electrode system