g.HIamp provides excellent signal resolution and a wide input sensitivity to record EEG, ECoG, ECG, EMG, and EOG without any saturation.

Introduction

g.HIamp is a high-performance biosignal amplifier with 256 channels for invasive and non-invasive measurements of the brain that is FDA cleared and CE approved. g.HIamp provides excellent signal resolution and a wide input sensitivity to record EEG, ECoG, ECG, EMG, and EOG without any saturation. External body sensors can also be connected. Internally, signal processing is performed with the fastest floating-point DSP and a sophisticated real-time 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 g.HIsys Highspeed Processing for Simulink software. This provides faster and more accurate control of BCI systems that use Common Spatial Patterns (CSP). g.HIamp is equipped with 16 digital trigger channels and a HOLD input for artifact suppression (e.g. during electrical or magnetic stimulation).

g.HIamp EEG amplifier has 16, 32,  80, 144 or 256 channels and can be used with passive or active EEG, ECoG, ECG, EMG and EOG electrodes. The difference between these options is just the electrode connector box. Each block of 64 channels is connected via a multi-pole medical safety connector to the electrode box. For ECoG grids and strips, special interface connectors are available too.

Product Highlights

Nima Mesgarani, PhD – Columbia University, New York, USA

“We are using g.tec’s g.HIamp and we are very happy with it! We are decoding speech which requires perfect synchronization and this is what we achieve with this fantastic device!”

Alex Ossadtchi, PhD – Director of Center for Bioelectric Interfaces, Moscow

“Fused with a variety of rapid prototyping and research software tools, g.HIamp serves as a unique tool in our clinical research applications to record electrocorticogram and local field potentials. The oversampling process executed by the internal DSP provides exceptional SNR and enables capturing higher frequency brain rhythms with superior quality.”

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Nuri Firat Ince, PhD – University of Houston, USA

“g.HIamp allows us to perform robust intraoperative recordings to ensure cortical and subcortical electrodes are placed in the correct functional regions, which is critical various clinical applications and research directions at the University of Florida Hospital.”

Aysegul Gunduz, PhD – University of Florida, USA

“The g.tec g.HIsys environment allows my lab to rapidly develop new applications. Biomedical engineering students here at Columbia University use the rapid prototyping environment during their education to get familiar with data acquisition, real-time processing and signal analysis.”

BRAIN MAPPING & EPILEPSY MONITORING

A passive brain mapping procedure based on electrocorticographic (ECoG) signals is a fast and precise mapping technique without the risk of causing pain or seizures. They can accurately identify cortical regions related to receptive and expressive language functions, motor functions and the somatosensory system in the brain.

g.HIamp biosignal amplifier can be used to realize brain mappings in the operating room or neuro monitoring unit.

SIMULTANEOS TMS & EEG RECORDINGS WITH ARTIFACT REMOVAL ALGORITHM

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, it is especially important to use the proper hardware and software. Read this article to learn how to perfectly record TMS and EEG at the same time.

RECORD EEG & FNIRS SIMULTANEOUSLY

g.HIamp in combination with g.SENSOR fNIRS enables simultaneous recordings of EEG and fNIRS (functional near-infrared spectroscopy) signals. A simultaneous recording of both fNIRS and EEG signals is highly beneficial because EEG signals indicate motor imagery while fNIRS signals show long lasting changes like mental counting or pain. In other words, researchers can capture what might be missed when using only EEG or fNIRS.

g.HIamp users can combine g.GAMMAsys technology to record from active g.LADYbird, active g.SCARABEO or g.SAHARA hybrid electrodes with 8 fNIRS sensors by using g.SENSOR fNIRS.

ACTIVE/PASSIVE ELECTRODE CONNECTOR BOXES

A useful feature of the g.HIamp biosignal amplifier is that the main amplifier can be used with all types of g.tec’s EEG electrodes (g.SAHARA, g.SCARABEO, g.LADYbird, g.PANGOLIN, cortiQ electrodes). for that reason, the g.HIamp is highly applicable for all types of neuroscience applications and simultaneous recordings of EEG and TMS/tDCS or fNIRS.

RECORDING ULTRA HIGH-DENSITY EEG

The g.Pangolin ultra high-density EEG electrodes can be used with g.HIamp biosignal amplifier to record high-resolution EEG. The g.Pangolin grids are connected with an active headstage amplifier to the g.HIamp. The g.Pangolin grids have 16 electrodes on a polygon shaped grid that can be mounted onto the head of the person. With the g.Pangolin, up to 1.024 EEG channels can be recorded from the human head to get EEG data with never seen spatial resolution.

RECORD HIGH-GAMMA UP TO 1 kHz

Clinical recording systems often have a limited sampling frequency and thus can’t reliably record frequencies above 80 Hz. This limits all the neuroscience and BCI experiments and developments to a frequency range from DC to 80 Hz. But we learned from experiments with g.HIamp that high-gamma activity goes all the way up to even 1 kHz! The g.HIamp is the only amplifier on the market that can actually register this tiny activity. This is possible because it performs a very high-oversampling, has a very steep anti-aliasing filter, has high quality amplifiers, can sample very high, has 24 BIT ADCs for each channel and has an input range from DC-6.8 kHz (almost 100 times wider). Never lose high-gamma components in your experiments just because you used the wrong equipment. Patients’ time is too valuable to waste, and so is yours. The image shows the ECoG modulation experiment done by Nuri Firat Ince’s team at University of Houston. The data are captured with g.HIamp during vibrotactile stimulation to the finger (PDF). The accelerometer sensor and stimulus duration are shown below.

FULL SOFTWARE ENVIRONMENT AVAILABLE

g.tec provides a broad spectrum of user-ready and customizable software solutions for different groups of users (e.g. engineers, researchers & scientists, physiologists, medical staff, along with software developers & programmers). g.HIamp is integrated into the main core of BCI2000 and OpenVIBE and supports the LSL (lab streaming layer) as well as a plugin for Dewesoft X that allows you to acquire data with g.HIamp biosignal amplifier inside the Dewesoft data acquisition system for automotive applications.

THE ULTIMATE RESEARCH EDITION

g.HIamp RESEARCH is the non-certified version of g.HIamp and offers 16/32/80/144/256 channels. Therefore, it is less expensive, and intended for research applications only. The device has freely accessible and configurable features, although any kind of ECoG experiments are excluded.

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