g.Nautilus fNIRS: Specs & Features

highly portable EEG and fNIRS in one device

Wireless EEG and fNIRS in one device

g.Nautilus fNIRS is g.tec’s new wireless EEG (Electroencephalogram) and fNIRS (functional near-infrared spectroscopy) acquisition system. fNIRS allows to assess the oxygenation status and hemodynamics of the brain non-invasively. The oxygenation depends on the light absorbance characteristic of hemoglobin in the blood. This allows to display the hemoglobin concentration in real-time. The fNIRS measures oxy-, deoxy- and total hemoglobin. The EEG measures the electrical activity of the brain and shows a high temporal resolution in contrast to fNIRS. The system combines both signals in a single device which sets a new standard of usability. The tiny and lightweight device (about 160g) is attached to the electrode/sensor g.GAMMAcap to avoid cable movements and to allow completely free movements. In combination with g.tec’s active electrode technology you will get top quality EEG recordings from 32/16/8 EEG channels and 8 fNIRS channels within a few minutes.

Technical details

The device comes with flexible cables for the EEG electrodes and fNIRS sensors to configure the electrodes positions as you wish. The g.GAMMAcap has 160 possible positions to plug in the electrodes and sensors. For cleaning it is easy to unplug everything. The optodes have a distance of 35 mm that is ensured with a spacer for high-quality recordings. g.Nautilus-fNIRS comes with two sets of fNIRS sensors: (i) sensors for the forehead and (ii) sensors that can be attached on regions with hair. The sensors are plugable and can be exchanged easily.

Product Highlights

  • Combined fNIRS and EEG measurements with a single wireless system
  • g.SCARABEO gel based EEG electrodes
  • LED based fNIRS sensors for the forehead and for central positions
  • Flexible solution: positioning of electrodes as you wish
  • 32/16/8 channel wireless EEG with 3-axis accelerometer
  • 24 bit accuracy at 500 Hz sampling rate (8/16/32 channels) for EEG
  • 10 Hz sampling rate for (8 channels) fNIRS
  • A new benchmark in usability
  • The only wireless system with active electrode technology
  • g.tec's unique internal impedance check with active electrodes
  • 10 hours continuous EEG recording and 2-3 hours charging (32 channel version); 6 hours of fNIRS recording
  • Wireless digital transmission, range: 10 meters indoor
  • Full integration into g.tec's software environment
  • Used for research applications only

Product Details

The g.Nautilus has a built-in lithium ion batteries for the EEG that allows for continuous recordings of up to 10 hours (32 channel version). The battery is recharged via a contactless charging pad within 2-3 hours. The fNIRS battery lasts for 6 hours and is interchangeable and rechargeable. The fNIRS battery is connected with a cable to the g.Nautilus-fNIRS and is worn in a pocket, but not on the head to reduce weight. g.Nautilus-fNIRS transmits data wireless with an indoor operating range of about 10 m.

The EEG input sensitivity of all channels is adjustable and the sampling rate can be set to 250 or 500 Hz (250 Hz with the 64 channel version). An electrode impedance check can be performed automatically via software, and a 3-axis acceleration sensor provides online head movement information along with the biosignals. The fNIRS is using 8 light emitting diodes with 2 wavelengths (760 and 850 nm). The data is sampled at 10 Hz.

The Base Station for g.Nautilus-fNIRS is a small receiver box connected to the PC via USB. 8 digital trigger lines can be connected to the base station to record event timing information. The pricing starts at 22.000 Euros.


g.HIsys for EEG and fNIRS

The g.Nautilus-fNIRS toolbox provides a Simulink model for EEG and fNIRS data acquisition. The g.Nautilus block is reading in the EEG data at 250 or 500 Hz and acts as the master for the Simulink model. The g.tec fNIRS Interface block reads the data at 10 Hz and is automatically synchronized with the EEG data. Both EEG and fNIRS data are provided with double precision of optimal signal processing resolution. The data can be visualized with the g.SCOPE to check data quality or save with the To File block. Additionally real-time signal processing can be configured with blocks from g.RTanalyze which are dedicated for biosignal processing or with standard Simulink blocks.

Application Fields & Possibilities of g.Nautilus-fNIRS

Wireless EEG and biosignal acquisition systems are becoming more important in Brain-Computer Interface research, especially when studies tend to take part in the field instead of in the lab. The tiny and lightweight device is attached to the EEG cap to avoid cable movements and to allow completely free movement. In combination with active electrode technology, top quality EEG recordings from 32/16/8 channels are easy to get within few minutes.

Rehabilitation

During stroke rehabilitation , patients perform different movements (e.g. hand movement, leg movement,…) and therefore it is very important to record artifact free EEG. Furthermore, patients participate in multiple recording sessions; active electrodes allow for an easy and fast montage setup of the EEG electrodes. BCI studies have shown that BCI performance in experiments performed with active electrodes is superior to passive electrodes.

Assessment

Disorders of Consciousness (DOC) patients are normally seated or lying in bed, and therefore a wireless solution is easier to mount than a wired EEG system. These patients may also suffer from uncontrollable movements, which could pull on the electrodes and degrade both the EEG quality and the clinical assessment. We have also noticed that fewer recordings are dismissed because of artifacts in the data when wireless systems are used. This is especially important for this patient group, where clean recordings are very difficult to acquire. A g.Nautilus with 16 active electrodes can be mounted within 1-2 minutes and this makes it particularly well suited for various brain assessments (ADHD, Parkinson, cognitive functions,…).

Communication

Communication systems for locked-in patients are used on a daily basis and therefore an easy and fast montage setup, coupled with high data quality, is essential. Dry electrode systems allows for a rapid montage setup with 8 EEG electrodes and gives nice data quality for recordings even at home. In this case it is important that active electrodes are used and that the device is very lightweight. The battery lasts for 8 hours of continuous recording and the completely sealed housing makes usage easier.

Sports Science & Medicine

In sports applications very light equipment is crucial, because otherwise nobody would want to wear an EEG device. g.Nautilus weights about as much as a climbing carabiner and has very compact packaging. The dry EEG version is well suited for high-altitude medicine because it does not require a hair wash. This is especially useful in remote locations where it would be difficult to get a hair wash. For faster sports, it is crucial to have very good contact between the head and the electrode and therefore the gel version is recommended for these applications. If the g.Nautilus is well prepped, people can even jump and run without seeing artifacts in the data.

Natalie Mrachacz-Kersting from Aalborg University in Denmark leads a research group that is engaged in basic neuromuscular mechanisms, their functional consequences mediating both acute adjustments (e.g., muscle fatigue, pain) and chronic adaptations (e.g., aging, training, stroke, rehabilitation). Read her user story: BCI Research at Aalborg University

Control

The high resolution EEG system enables exoskeleton control with motor imagery, P300 and SSVEP based BCI systems. The system has electrodes over the brain regions most important for finding control signals (motor cortex, central areas, visual cortex) for every type of BCI. The high number of electrodes can also be used for spatial filtering of the data to further improve the control quality.

Read the interview with Dr. Hiroshi Ishiguro who has been using g.Nautilus to control his robots: When Robots replace Humans

Response/Aviation

g.Nautilus can also be used easily in aviation because of the fast montage setup and the artifact-free data, even in moving objects. Therefore, the system can easily be used in cars, plains, flight simulators and even g-simulators for pilots and astronauts. Very often VR is used to simulate such aviation scenarios, and persons are embedded in a virtual environment where embodiment is increased when they are not wired up to other equipment. A BCI system in VR allows the user to navigate or control the scenario without touching everything. g.Nautilus also works nicely together with eye-trackers and video cameras so that electrophysiological parameters can be analyzed for neuromarketing applications.

New Versions of g.Nautilus

The wireless g.Nautilus system opens up many new research areas that were not possible beforehand. For example, it can be used easily with children because it sits completely on the head and children do not try to remove it. Furthermore, free-moving applications can now be studied and participants are not locked to certain locations. Finally, on demand EEG recordings can be triggered by external events while the user is wearing the system.


Expert Quotes

g.Nautilus fNIRS provides the unique opportunity of acquiring fNIRS and EEG signal in a single device and to analyze both signal types in real-time.

- Christoph Guger, CEO g.tec medical engineering

EEG provides a very high temporal resolution which is ideal to capture rapid changes in the brain. On the other hand some brain activities are longer and will be missed with the EEG, but can be captured with the fNIRS.

- Günter Edlinger, CEO g.tec medical engineering


Available configurations

Hardware and Accessories

product no.: 5608 read more g.Nautilus fNIRS 8 channels — 8 active EEG channels and 8 fNIRS channels; electrodes prefixed on a medium cap; 24 bit EEG resolution; 250 or 500 Hz sample rate; 10 Hz sample rate fNIRS; 1 set of 8+2 sensors for forehead; 1 set of 8+2 sensors for positions according to the 10/20 system; built in 3-axis acceleration sensor; two Lithium ION batteries in Compliance with Section II of PI967, chargeable batteries; wireless data transmission; internal impedance check; non-medical, for research only; flexible electrode positioning;
product no.: 5616 read more g.Nautilus fNIRS 16 channels — 16 active EEG channels and 8 fNIRS channels; electrodes prefixed on a medium cap; 24 bit EEG resolution; 250 or 500 Hz sample rate; 10 Hz sample rate fNIRS; 1 set of 8+2 sensors for forehead; 1 set of 8+2 sensors for positions according to the 10/20 system; built in 3-axis acceleration sensor; two Lithium ION batteries in Compliance with Section II of PI967, chargeable batteries; wireless data transmission; internal impedance check; non-medical, for research only; flexible electrode positioning;
product no.: 5632 read more g.Nautilus fNIRS 32 channels — 32 active EEG channels and 8 fNIRS channels; electrodes prefixed on a medium cap; 24 bit EEG resolution; 250 or 500 Hz sample rate; 10 Hz sample rate fNIRS; 1 set of 8+2 sensors for forehead; 1 set of 8+2 sensors for positions according to the 10/20 system; built in 3-axis acceleration sensor; two Lithium ION batteries in Compliance with Section II of PI967, chargeable batteries; wireless data transmission; internal impedance check; non-medical, for research only; flexible electrode positioning;

See some related products

Software

product no.: 0111 read more g.RTanalyze: Specs & Features — real-time biosignal processing blockset under SIMULINK; real-time algorithms
product no.: 0260E read more Highspeed Online Processing Under Simulink for g.Nautilus — SIMULINK driver and blockset modules; data processing with maximum system speed

Electrodes and Sensors

product no.: 5300S_3 read more g.GAMMAcap3 for g.Nautilus, Size S, 5mm — electrode cap with 74 standard, for g.Nautilus with g.LADYbird, extended 10/20 system and 86 intermediate positions; size: S (50-54cm); chin strap and occipital velcro pad
product no.: 5300M_3 read more g.GAMMAcap3 for g.Nautilus, Size M, 5mm — electrode cap with 74 standard, for g.Nautilus with g.LADYbird, extended 10/20 system and 86 intermediate positions; size: M (54-58cm); chin strap and occipital velcro pad
product no.: 5300L_3 read more g.GAMMAcap3 for g.Nautilus, Size L, 5mm — electrode cap with 74 standard, for g.Nautilus with g.LADYbird, extended 10/20 system and 86 intermediate positions; size: L (58-62cm); chin strap and occipital velcro pad
product no.: 5300S_2 read more g.GAMMAcap2 for g.Nautilus, Size S, 2mm — electrode cap with 74 standard, for g.Nautilus with g.SAHARA and g.SCARABEO, extended 10/20 system and 86 intermediate positions; size: S (50-54cm); chin strap and occipital velcro pad
product no.: 5300M_2 read more g.GAMMAcap2 for g.Nautilus, Size M, 2mm — electrode cap with 74 standard, for g.Nautilus with g.SAHARA and g.SCARABEO, extended 10/20 system and 86 intermediate positions; size: M (54-58cm); chin strap and occipital velcro pad
product no.: 5300L_2 read more g.GAMMAcap2 for g.Nautilus, Size L, 2mm — electrode cap with 74 standard, for g.Nautilus with g.SAHARA and g.SCARABEO, extended 10/20 system and 86 intermediate positions; size: L (58-62cm); chin strap and occipital velcro pad
product no.: 1023 (mini, midi, maxi) read more g.GAMMAcap2KIDS — electrode cap for kids with 74 standard positions; international 10-10/extended 10-20 system
product no.: 1027b read more g.GAMMAcap2SETKIDS — set of 3 caps (size mini, midi, maxi), 74 standard positions according to the international 10-10/extended 10-20 system, additional positions can be added freely by the user, includes 1 chest belt set

Hardware and Accessories

product no.: 5323 read more Trigger cable for g.Nautilus (g.TRIGbox) — Trigger cable to connect 4 trigger inputs of the g.Nautilus base station to the output connector of g.TRIGbox (15-pin, sub-D). Length: 3 m
product no.: 5322 read more Trigger cable for g.Nautilus (g.STIMbox) — Trigger cable to connect the 8 trigger inputs of the g.Nautilus base station to the digital output connector of g.STIMbox (26-pin, sub-D). Length: 3 m
product no.: 5321 read more Trigger cable for g.Nautilus (Parallel Port) — Trigger cable to connect the 8 trigger inputs of the g.Nautilus base station to the parallel port (25-pin, sub-D). Can be used with E-prime or Presentation stimulation system. Length: 3 m

Related Media and Documents

Lectures

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Lecture 1: EEG — 26/11/2015 — 6.94 MB
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Lecture 2: BCI — 26/11/2015 — 4.23 MB
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Lecture 4: EP — 23/09/2016 — 19.05 MB
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Lecture 6: g.Nautilus Sports — 26/11/2015 — 106.97 MB
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Lecture 5: PhysioObserver — 26/11/2015 — 502.23 MB

2016

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g.tec product catalogue 2016_web_gNautilus — 16/12/2016 — 7.06 MB

Product Manuals/Handbooks

g.Nautilus PRO

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gNautilus_Pro_InstructionForUse_FDA — 23/10/2017 — 5.08 MB