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g.tec medical engineering · Software

g.HIsys

Real-time biosignal processing for Simulink

g.HIsys acquires biosignals inside a Simulink model and lets you process them in real time, in depth; it works fully with g.HIamp, g.USBamp and g.Nautilus. Its rapid prototyping environment gets your first real-time experiments running within a few hours; you can use every standard Simulink block and write your own in MATLAB or C. g.HIsys Professional is part of g.tec Suite 2024 and holds hundreds of dedicated functions for BCI and neuroscience experiments.

  • MATLAB / Simulink
  • Real-time BCI
  • OSCAR LIVE
  • 3D brain mapping
  • fNIRS integration
3D evoked potential maps in g.HIsys

Highlights

  • Record and process EEG, ECoG, ECG, EMG, EOG, fNIRS and spike data in Simulink
  • Wireless with g.Nautilus; 16–1,014 channels with g.USBamp and g.HIamp
  • No need to compile the Simulink model for real-time analysis
  • Real-time artefact removal with OSCAR LIVE
  • Map cortical activity onto 3D models and see evoked potentials in real time
  • Auditory, vibrotactile and FES stimulation: control of g.AUDIObox, g.STIMbox and g.ESTIM FES
  • Eye-movement data recorded together with biosignals
  • Your own algorithms as MATLAB or C S-Functions; data to the MATLAB workspace or to file

Technical specifications

Environment
MATLAB / Simulink
Compatible amplifiers
g.HIamp · g.USBamp · g.Nautilus (several in one model)
Signals
EEG · ECoG · EMG · EOG · ECG · fNIRS · spikes
Sampling
Up to 38.4 kHz per channel
Parameter estimation
Hjorth · Barlow · bandpower · variance · RLS · Kalman · LMS · adaptive AR
BCI methods
P300 · motor imagery · SSVEP / SSSEP · slow cortical potentials
Classifiers
LDA · SVM
Interfaces
UDP · LSL · g.NEEDaccess · eye-tracker interface
Stimulation control
g.AUDIObox · g.STIMbox · g.ESTIM FES
Package
g.tec Suite 2024
Block library

BCI by drag and drop

The g.HIsys block library

Preprocessing, parameter estimation and classification algorithms are dragged into your Simulink application. The library holds filters (source derivation, notch, cascaded notch, EEG/ECG band filters), input and output (markers, UDP, LSL), experiments (Paradigm Presenter, video, audio and text stimulation, g.STIMbox control), feature extraction (ERD, FFT, power spectrum, spectrogram), signal quality and file blocks that record at up to 38.4 kHz. For visualisation there are Scope, EP Scope, Spectrum and Spectrogram Scopes and 3D scopes that show cortical activation on the head or the cortex.

  • Filters
  • Feature extraction
  • Paradigm Presenter
  • 3D scopes
Multimodal recording

EEG with fNIRS, eye tracking and VR

EEG and eye-tracking recording in a car

The fNIRS toolbox records and analyses EEG and fNIRS at the same sampling rate; it is made for g.SENSOR fNIRS, and other fNIRS systems connect through LSL. The eye-tracker interface records gaze data and the eye's x and y coordinates together with biosignals. The UDP interface passes data to virtual reality systems or to a Simulink session on another computer.

  • EEG + fNIRS
  • Eye tracking
  • UDP and VR
  • LSL
Neuromodulation

CCEP, ECS and SEP mapping

Results on a 3D brain model

The Neuromodulation Toolbox combines continuous acquisition, stimulation and switching between systems in one structure: advanced applications such as CCEP screening, electrocortical stimulation (ECS) mapping and SEP mapping are easy to set up.

  • CCEP screening
  • ECS mapping
  • SEP mapping
Example

Driving an excavator at Ars Electronica

Controlling an excavator by BCI at Ars Electronica

At the Ars Electronica Festival, g.HIsys was used to control an excavator's movements; visitors steered it with their P300 and related signals. The BCI was calibrated with 5 minutes of EEG taken in g.BSanalyze, and g.HIsys decided on the users' intent in real time.

  • P300 BCI
  • Real-time control

Video

A talk recorded at the BCI & Neurotech Spring School 2024: how closed-loop systems developed, their role in understanding brain function and their therapeutic potential.

Up close

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Contact

Let's plan your project together.

Talk to our team about device selection, protocol design, installation and software integration. We will work out the technical configuration that best fits your research or clinical goal.

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