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fNIRS (functional near infrared spectroscopy) measures the oxygenation level and hemodynamics of the brain, non-invasively. The oxygenation level changes as brain areas become more active. Researchers can identify brain activity in real-time based on changes in blood oxygenation and other factors. fNIRS is measured with optodes, using LEDs or lasers to emit light into the brain and the reflected light is measured with a detector. By looking at a certain wavelength of the light, the absorption of the hemoglobin and the blood flow in certain brain regions can be measured. These optodes normally have a distance of 20-30 mm from each other and the fNIRS signal measures the blood flow in between these optodes.

EEG (electroencephalogram) measures the electrical activity of the neurons right underneath the electrodes and provides high temporal resolution, unlike fNIRS. Simultaneous recording of both fNIRS and EEG signals is highly beneficial. EEG signals are used in applications such as motor imagery experiments 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.tec has the ideal solution for combined EEG and fNIRS recordings: You can choose between several EEG and biosignal amplifiers, active wet or hybrid dry EEG electrodes, different sizes of EEG caps and a software solution to quickly set up your neuroscience experiment. Use g.tec’s biosignal amplifiers or wearable EEG headsets such as g.HIamp, g.USBampg.Nautilus  PRO Flexible, g.Nautilus Multi-Purpose, g.Nautilus PRO or g.Nautilus RESEARCH to measure high-quality EEG signals together with the fNIRS signals. The EEG electrodes and the fNIRS optodes are assembled together in one EEG cap to have well defined positions and proper contact to the scalp.

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g.NAUTILUS EEG WITH g.SENSOR fNIRS

g.Nautilus RESEARCH and g.Nautilus MULTI-PURPOSE in combination with g.SENSOR fNIRS enable simultaneous recordings of EEG and fNIRS (functional near-infrared spectroscopy) signals. In combination with g.tec’s active EEG electrode technology, researchers get top-quality EEG recordings from 64/32/16/8 g.SCARABEO EEG channels and 8 fNIRS channels within a few minutes.

g.Nautilus PRO FLEXIBLE allows you to plug-in electrode strands with g.SAHARA hybrid EEG electrodes or g.SCARABEO wet EEG electrodes and g.SENSOR fNIRS adds 8 fNIRS channels. Simply pick an electrode strand best suited for your appliation. The different electrode strands hold 8/16/19/32 EEG electrodes. Additional Safety Connectors allow you to plug in different types of body sensors.

  • Strand g.SCARABEO
  • Strand g.SAHARA Hybrid
  • Strand g.SCARABEO + 4  Safety Connectors
  • Strand g.SAHARA Hybrid + 4  Safety Connectors
  • Strand Safety Connectors Only

g.SENSOR fNIRS with 8 optodes can be inserted into the optode holders of g.GAMMAcap fNIRS. The cap has one set of optode holders on the frontal cortex and another set of optode holders over the sensorimotor cortex. The device comes with low-power optodes for the frontal cortex and high-power optodes for the sensorimotor cortex.

g.GAMMAcap fNIRS perfectly works for mounting g.SENSOR fNIRS together with g.SCARABEO electrodes or g.SAHARA hybrid electrodes. g.SENSOR fNIRS can be attached with a magnet holder to g.Nautilus and the optodes can be inserted into pre-defined positions over the sensorimotor-cortex and/or frontal cortex.

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PRODUCT HIGHLIGHTS

10 Hz sampling rate for (8 channels) fNIRS
8 fNIRS transmitters and 2 receivers
High-power optodes for recordings on the sensorimotor cortex
Low-power optodes for recordings on the frontal cortex
1.5 hours (high-power LED) - 8 hours (low-power LED) fNIRS recordings
Wireless digital transmission, range: 10 meters indoor
Fully integrated in g.HIsys software environment
Fully integrated wireless EEG and fNIRS system
Available with g.Nautilus Research, g.Nautilus Multi-Purpose and g.Nautilus PRO flexible
8/16/32 or 64 EEG channels

TECHNICAL SPECIFICATIONS

fNIRS SupplyExchangeable lithium ion battery
fNIRS sampling frequency10 Hz
Number of transmitters8
Number of receivers2
EEG sampling frequency250/500 Hz for 8/16/32 channels, 250 Hz for 64 channels

g.HIAMP & g.USBAMP WITH g.SENSOR fNIRS

g.HIamp and g.USBamp 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. 8/16/32/64 EEG electrodes can be assembled with a certain montage.

g.SENSOR fNIRS can be attached with a magnet holder to the cap and the optodes can be inserted into pre-defined positions over the sensorimotor-cortex and/or frontal cortex into the optode holder. The 8/ 16/32/64 EEG electrodes are inserted into the holder rings indicated in blue.

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g.NAUTILUS, g.USBAMP & g.HIAMP WITH NIRx

g.Nautilus, g.USBamp and g.HIamp can all be used with the NIRSport2 system. The g.GAMMAcap is available with 8/16/32/64 EEG channels with g.SCARABEO electrode holder rings that allow you to insert g.SCARABEO electrodes into certain positions. Additionally, the g.GAMMAcap has 32 NIRx optode holders to assemble 16 sources and 16 detectors on the left and right sensorimotor cortex. NIRSport2 is available with 8 sources and 8 detectors as well. The fNIRS cables are fixed with a velcro on the back of the g.GAMMAcap and are connected to the NIRSport2 system. Both the EEG data and the fNIRS data are transmitted to the same computer and are precisely synchronized with triggers if two data streams are handled or both are streamed into one synchronized data set using g.HIsys Professional.

Select the g.Nautilus Research, g.Nautilus Multi-Purpose or the g.Nautilus PRO flexible togther with NIRSport2 to get a fully portable and wireless solution. If you need higher sampling frequencies or more EEG channels for the EEG, select g.HIamp and g.USBamp.

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PRODUCT HIGHLIGHTS

Performing dual-wavelength continuous-wave near infrared diffuse tomographic measurements on large tissue structures at high sampling rates
Facilitating NIR illumination of multiple target locations in a time-multiplexed, scanning fashion
LED emitters at two distinct wavelengths allows discrimination of the two oxygenation states of tissue hemoglobin
Employing parallel readout of multiple optical detector channels, each of which uses adaptive gain switching to maximize the dynamic measurement range
8 parallel optically isolated digital input channels (TTL level) for the acquisition of event trigger signals
5-6 hours battery capacity
A new benchmark in usability
Fully integrated in g.HIsys software environment
Can be used with g.USBamp, g.HIamp or g.Nautilus.
8/16/32 or 64 EEG channels

TECHNICAL SPECIFICATIONS

Number of Sources8 or 16
Number of Detectors8 or 16
Source Wavelengths760 nm & 850 nm
Sampling RateUp to 70 - 240 Hz
Detection SensorSi Photodiode or APD
Data TransmissionWiFi, USB, internal storage
Detector Dynamic Range50 dBopt
Detector Sensitivity<1 pW / < 0.1 pW for APDs
Event SynchronizationWireless (LSL), Cable (8 bit TTL input)
Spectroscopic TechniqueContinuous Wave
Sampling frequency EEGUp to 38.4 kHz for g.USBamp and g.HIamp, 250/500 Hz for g.Nautilus

ASSEMBLING OF NIRx IN g.GAMMACAP

The optodes can be inserted into the light blue optode holder ringers coming with the g.GAMMAcap. The 8/16/32/64 EEG electrodes are inserted into the dark blue electrode holder rings.

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Choose biosignal amplifier

Select fNIRS / NIRx in Assembling

Select fNIRS / NIRx sensor

YOUR COMBINED EEG & FNIRS RECORDING

Combined EEG & fNIRS/NIRx

g.HIAMP
g.HIAMP
g.USBamp 16 Channel EEG amplifier g.USBAMP
g.Nautilus Research wearable EEG headset g.NAUTILUS Multi-Purpose
g.Nautilus PRO g.NAUTILUS PRO
g.Nautilus Flexible g.NAUTILUS PRO Flexible
g.Nautilus Research wearable EEG headset g.NAUTILUS RESEARCH
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