DSI-4 Sleep System

The DSI-4 is a complete, research-grade wireless EEG system designed for rapid application of 4 dry electrode EEG sensors on the forehead. This unique fully-integrated wireless EEG system is embedded in a comfortable adult-sized a headband designed for use during sleep.

The system comprises ultra-high impedance active Dry Sensor Interface (DSI) sensors that require no skin preparation or conductive gels. The sensors are spring-loaded to provide constant, comfortable contact pressure that mitigates movement artifacts seen during motion and are actively and passively shielded to prevent contamination from electrical artifacts. The adjustable headband is foam padded and washable. The DSI-4 is intended for unobtrusive use during daily ambulatory activities or sleep.

Synchronized Interfaces:

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

 

System Features

• Uncompromising Signal Quality
  • Active dry electrode sensor with 2-stage amplification and digitization in the headset
  • Research-grade EEG signal (>90% correlation with conventional wet electrode systems)
  • Patented artifact-resistant electro-mechanical designs suitable for ambulation in naturalistic environments
  • Continuous impedance and signal quality monitoring
• Practical EEG
  • Fully integrated, complete EEG system in a single device Rapid set-up (< 1 min) and clean-up time (< 1 min) Adjustable to fit a wide range of head sizes
    • Adult version: 52-62 cm circumference
    • Child version: 48-54 cm circumference
  • Comfortable for continuous daily and sleep use
• Powerful Features
  • Bluetooth transmission
  • Embedded 3D accelerometers
  • Removable electronics & machine washable headband
  • Compatible with QStates, cognitive classification algorithm
  • Compatible with in-ear headphone for auditory stimulation
• Intuitive Software Included
  • DSI-Streamer
    • Signal quality metrics
    • Evoked Response Potentials (ERPs)
    • File formats: EDF, CSV (filtered and raw)
  • C-based API for Windows/Mac/Linux
  • LSL, TCP/IP streaming

 

Technical Specifications

Sensor locations:	F7, F8, FP1, and FP2
Reference:	Fz (Common-mode-follower)
Ground:	Fpz
Positional accuracy:	Within 1.5 cm
Amplifier/digitizer:	16 bits, 4 channels
A/D resolution:	0.3 μV referred to input
Sampling rate:	300 Hz (600 Hz option)
Bandwidth:	0.003-150 Hz
Gain:	60 x
CMRR:	> 120 dB
Channel cross-talk:	< -70 dB with sensors
Input impedance (1Hz):	47 GΩ
Input bias current:	< 25 pA
DC offset tolerance:	± 200 mV
Maximum input range:	10mV p-p
Shorted Input Noise (1-50Hz):	< 1 μV
Digital inputs:	4 bits
Wireless:	Bluetooth
Wireless range:	10 m
Run-time:	> 12 h