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Computerized Biofeedback and Neurofeedback Systems


NeXus-4 Wireless Bluetooth Biofeedback




The NeXus-4 is a small and high-end biofeedback and neurofeedback system which is totally suitable for professional grade physiological monitoring, and clinical applications.

Starter system for biofeedback and neurofeedback

Our most affordable 4 channel system can be used for all kinds of biofeedback and neurofeedback applications by measuring a wide variety of signals such as brainwaves (EEG), muscle tension, heart rate, relative blood flow, skin conductance, respiration, temperature, and many more. The NeXus-4 is so small it fits in your pocket and it communicates wirelessly with your computer using bluetooth technology. Thanks to its portability the NeXus-4 provides the user with a great deal of freedom in movement during a session. Its built-in flash memory of 64 MB can store more than 8 hours of physiological ambulant data.

Versatile and flexible solution

The NeXus-4 comes with the easy to use and highy customizable BioTrace+ software, with free lifetime updates. BioTrace+ is a complete software package for physiological monitoring and a wide range of biofeedback and neurofeedback applications. Create reports with statistics or just export the data and use it for further analysis. The NeXus-4 also includes 4 batteries, Bluetooth dongle, leather system case, manuals, and a protective carrying case.

Take a look at our solutions and our physiological sensors to explore the full possibilities of the NeXus-4.

High quality and reliable signal recording

With the high medical grade connectors that lock-in, there is neither noise nor artifact when touching or pulling them. Artifacts through movement of cables or other external sources of noise are reduced to a minimum, because of cutting edge active noise cancellation technology and carbon coated cables. Prevention is better than cure; the goal is to prevent artifacts, not to delete them afterwards and thereby deleting valuable data as well. NeXus systems are built with high quality electronics. It is easy to get good and very reliable signals with less preparation time. No cables going to your computer, providing a high freedom of movement.



The NeXus-4 for biofeedback, neurofeedback, and physiological monitoring has the following features:


Mind Media offers solutions for almost every biofeedback and neurofeedback applications and for physiological monitoring. Off course every solution can be adjusted to create a perfect fit for every application. The following solutions are offered for the NeXus-4:

  Total solution   Biofeedback solution   Neurofeedback solution
Software BioTrace+   BioTrace+   BioTrace+
Sensors EXG* & Ground  
EXG* & Ground
EXG* & Ground
  Skin Conductance  
Skin Conductance
Electrodes EXG Meditrace  
EXG Meditrace
EEG Discs
  EEG Discs        
Accessories Minicap      
  Preparation Gel      
Preparation Gel
  Conducting Gel      
Conducting Gel

*The EXG sensor delivers 2 signals of EEG, sEMG, ECG, or EOG.

Possible add-ons:

  • BVP Head Sensor for migraine training
  • EMG Pelvic Floor Sensor (Vaginal and/or Rectal) for incontinence training
  • SCP Sensor (including accessories) for EEG below 1 Hz


The technical specifications of the NeXus-4 are:

Number of channels 4
Size (approx.) 112 X 66 x 28 mm
Weight (approx.) 138 grams
Display -
ADC output/resolution 24 bits
Safety class Class II
Warranty 2 years
EXG channels  
Number of channels 2
- EMG Up to 2
- EEG Up to 2
- EOG Up to 2
- ECG Up to 2
- SCP -
Input signal range -100mV / + 100mV
Input common mode range -2.0 Volt ..... +2.0 Volt
Sample rate 1024 Hz (samples/sec)
Gain factor 19,5
Noise <1 uV RMS (@256 SPS, EEG 1-45 Hz)
Input impedance > 10^12 Ohm
CMRR (typical) > 100 dB
Accuracy +- 2%
Connector Lemo OB series 6 pin (2 channels)
AUX channels  
Number of channels 2
- Skin conductance Up to 2
- Temperature Up to 2
- BVP/ HR Up to 2
- Respiration Up to 2
- HEG 2 inputs required
- Force Up to 2
- Accelerometry (3D) -
Input signal range -2.0 Volt ..... +2.0 Volt
Input common mode range -2.0 Volt ..... +2.0 Volt
Sample rate 128 Hz (samples/sec)
Gain factor 1x
Noise <3 uV RMS (1-64 Hz freq. Range)
Input impedance > 10^10 Ohm
CMRR (typical) 70 dB
Accuracy +- 2%
Connector Lemo OB series 5 pin
Other channels  
Oximetry -
Unipolar EEG -
Digital -
Trigger/ synchronization -
Bluetooth Connection up to 10 meters
Flash memory Internal 64 MB
Power source 2x AA batteries
Battery life 8+ hours
External power source -

PC Specs

Optimal Requirements:

•  Windows 7, 8  Professional (32/64 bit), Windows 10 Professional
• BioTrace version 2014a (or higher)

• i5 or i7 series Intel processor, 2.2Ghz or faster
• 4 GB RAM (8GB Suggested)
• 500 GB Hard drive (SSD suggested)
• Soundcard
• Graphics card with 512mb memory or more
• HD+ (1600x900) or Full HD (1920 x 1080) Screen resolution
• Free USB 2.0 or 3.0 Port
• Bluetooth 2.0* or higher

Hardware - Other
• CD/DVD drive (for installation of BioTrace and Video Playback** in BioTrace)
Download links are available if no CD/DVD drive is available)

Additional Requirements:
* It is required to use Microsoft Windows BlueTooth Stack and not a 3rd Party Bluetooth Stack
(Stens offers a compatible USB BlueTooth dongle)
** DVD-feedback functionality is only supported by Windows 8.1 Pro with Media Center Pack (v2015a BioTrace and up)

Apple Macintosh:
BioTrace+ is only compatible with a Windows based Operating System. Apple offers Bootcamp (Mac OS X v10.8 and up), for installing Windows on a Macintosh: