DSI-Hybrid-EEG+fNIR

wearable sensing

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Dry + Synchronized + Mobile

The DSI-Hybrid EEG + fNIR headset is a complete, research-grade, combined wireless EEG and fNIR system designed for synchronized recording of the brain’s electrical activity and its hemodynamic response or blood-oxygen-level-dependent (BOLD) response. The EEG and fNIR sensors are arranged to allow simultaneous and superimposed recordings at locations distributed on the scalp.

  • Active dry electrode EEG sensor with 2 stage amplification and digitization in headset delivers research-grade EEG signal (>90% correlation with conventional wet electrode systems)
  • Triple frequency ultra-bright LED emitters and amplified detectors offer reliable through hair fNIR
  • fNIR optodes arranged around dry electrode EEG sensors for co-registered measurement of EEG and BOLD
  • Patented artefact resistant electro-mechanical designs enable ambulation in naturalistic environments
  • Short- and Long-light paths fNIR measurements empower integrated algorithms for regression of Mayer wave artefact.

Practical EEG and fNIR:

  • Fully integrated and synchronized, complete EEG and fNIR system in a single device
  • Ideal for combined hemodynamic and electrophysiological research
  • Autodetection of optical emitters and detectors to use for each fNIR location
  • Raw fNIR signals converted to changes in concentration of oxygenated and deoxygenated haemoglobin (BOLD)
  • Rapid set-up and clean-up time
  • Adjustable to fit a wide range of head sizes (52-62 cm)

Powerful Options:

  • 8 channel locations with combined EEG and fNIR for concomitant measurement of EEG and fNIR
  • Provides excellent temporal precision from EEG combined with spatial precision from fNIR.
  • Wireless triggering for synchronization of multiple devices (hyper-scanning) and ambulatory ERPs
  • Bluetooth or wired-USB transmission
  • Adjustable power settings for each emitter LED wavelength

Applications:

The DSI-Hybrid-EEG+fNIR’s practicality, portability, and high signal quality open the door to taking numerous applications that were previously limited to lab environments to more naturalistic settings. Such applications include:

  • Neuroscience research
  • Brain-Computer Interfaces
  • Neurovascular Coupling
  • Neurofeedback
  • Neuromarketing
  • Biomarkers

Synchronized Interfaces:

  • Eye-tracking
  • Motion capture
  • NeuroGuide / BrainSurfer
  • EEGLAB / ERPLAB /BCILAB
  • Mensia Neuro RT / OpenVibe
  • TEA Ergo CAPTIVA
  • BCI2000
  • E-Prime
  • Inquisit
  • Presentation

Intuitive Software Included:

  • DSI-Streamer
  • Signal quality metrics
  • Montages
  • ERPs
  • File formats: EDF, CSV (filtered and raw)
  • Streaming via TCP/IP socket-based API for Windows/Mac/Linux
  • LSL streaming

Specification:

  • fNIR emitters and detectors: 4 pairs per sensor
  • Emitter Frequencies: 760, 808, 850 nm
  • fNIR Sampling Rate: 15 Hz
  • fNIR Bandwidth: 40 nm
  • Sensor Locations 8 sensors at 10-20 locations: Fp1, Fp2, C3, C4, T7/T3, T8/T4, O1, O2, A1, A2
  • Common-Mode-Follower: Pz is the default reference (can be changed to LE in software)
  • Ground Fez
  • Amplifier/Digitizer: 16 bits, 8 channels
  • Analog/Digital Resolution: 0.317 UV referred to input
  • Analog/Digital Converter: 16 bits
  • EEG Sampling Rate: 300 Hz
  • EEG Bandwidth: 0.003-150 Hz
  • Gain: 60
  • Common Mode Rejection Ratio: > 120 dB
  • Channel Cross-Talk: < -70 dB with sensors
  • Input Impedance (1Hz): 47 Gohm
  • Input Bias Current: <25 pA
  • DC Offset Tolerance: +/-200 mV
  • Maximum Input Range: 10mV pk-pk
  • Noise (1-50Hz) :< 1 UV RMS
  • Digital Inputs: 8-bit input
  • Run-time: 4 h
  • Wireless: Bluetooth
  • Wireless Range: 10 m
  • Headset weight: 513 g
  • Headsize Fit: 52-62 cm circumference

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