fMRI-compatible full-band DC-EEG biofeedback system

NEURO PRAX® MR systems measures physiological activity such as EEG, EMG, and EP signals simultaneously and synchronously for all channels. Unique amplifier technology captures EEG activities from infraslow (0 - 0.3 Hz) to ultrafast (80 - 1,200 Hz) frequencies.

The high dynamic range of our amplifiers and the integrated online correction of gradient and pulse artifacts make the NEURO PRAX® MR particularly suitable for measuring EEG, ECG, EMG, or GSR during functional Magnetic Resonance Imaging (fMRI).

The full-band MR-compatible DC-EEG provide a wide range of optional software-based functions such as online correction of artifacts, topographical analyses, spectral and amplitude mapping, and online averaging. The NEURO PRAX® MR 8 allows to record the galvanic skin response (GSR) and the EMG.

The NEURO PRAX® MR is a biofeedback device according to the FDA Regulation Number 882.5050. It supports researchers to learn to self-regulate their brain activity (EEG biofeedback). It is intended to be used for EEG biofeedback with the slow cortical potentials (SCP) protocol.

NEURO PRAX® MR* Features

  • 32-channel full-band DC-EEG biofeedback system (8, 64 channels)*
  • Channel type (EEG, EMG, ECG) selectable via software
  • Non-referential storage of raw data
  • Online correction of gradient artifacts during fMRI by means of soft- and hardware synchronization**
  • Real time correction of pulse artifacts
  • Suitable for polygraphy and polysomnography
  • Simple and intuitive user interface
  • EEG mountings and event markers freely selectable
  • Research participant database, including experimental protocols and timelines, with comprehensive documentation.
  • Topographical analyses, spectral and amplitude mapping
  • Display of averaged evoked responses during fMRI-scans
  • Connection to external trigger sources
  • Module ACTIVE SYNC MR for high end gradient artefact correction
  • * optional ** hardware synchronisation optional

Options and system extensions

  • module to correct EEG artifacts
  • module for cognitive evoked potentials: CNV, CPTOX, P300, ERN, and BP (not inside MRI scanner)
  • feedback module system extension (additional monitor)
  • NEURO PRAX® examination license from other PC
  • module for online data access via Ethernet by TCP/IP
  • export module for exporting measured data into other formats
  • module for data access within MATLAB®/Simulink®, LabVIEW®, C/C++
  • optical Trigger Module system extension for external trigger input
  • Module for source localization of EEG and fMRIEEG data
  • rechargeable battery pack (not inside fMRI scanner)

NEURO PRAX® MR* corrects imaging artifacts during MRI-EEG.

Areas of Application

  • Research in neurology: fMRI and full-band DC-EEG, fMRI and EP/EMG
  • Cognitive neuroscience and Behavioral science: fMRI and EP, fMRI and GSR, facial EMG
  • EEG biofeedback research: fMRI and DC-EEGfeedback, 3D EEG feedbackG


  • Brochure
  • Measuring and Modulating Brain Activity

Technical Data

  • 32 full-band DC-channels (64, 128 channels)*
  • input impedance > 10 G
  • 24-bit resolution per channel
  • selectable sampling rates of 60 to 4,000 sps
  • frequency range of 0 to 1,200 Hz @ 4,000 Hz sampling rate
  • common mode rejection rate (CMRR) > 90 dB @ 50 Hz
  • dynamic input range approx. ±175 mV
  • input noise < 0.9 μV (RMS) @ 0 - 110 Hz at 250 sps
  • max. power consumption 1.5 W
  • continuous operation time > 8 h
  • power supply via built-in rechargeable batteries
  • applied part BF
  • dimensions in mm: 290 x 130 x 200 (W x D x H)
  • weight: 4.2 kg (incl. batteries)
  • data transmission via optical fiber
  • electrode input box, incl. connector cable (32, 64 channels)
  • measurement of Galvanic Skin Response (GSR) during functional MRI***
  • * optional *** only available in NEURO PRAX® MR 8
  • powerful Intel™ Core Duo processor, min. 1 GB RAM, 500 GB hard disc
  • USB 2.0, ethernet interface (LAN), min. 15“ TFT color monitor, keyboard, mouse
  • operating system WINDOWS® 10 (and later)
  • operating voltage 100-240 V @ 60/50 Hz AC
  • dimensions in mm: 420 x 365 x 170 (W x D x H)
  • weight: 11.6 kg (incl. stand)

Items marked with* are investigational devices and for research use only. CAUTION - Investigational Device. Limited by Federal (or United States) law to investigational use.