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Research

EEG Measurement

Overview

EEG System

iWorx EEG System is used for measuring electroencephalography (EEG) activity in humans for cognitive neuroscience and psychological physiology research.

The system enables researchers to study brain responses to visual and auditory stimuli (pictures, letters, and sounds) as well as tactile, olfactory and gustatory stimuli for ERP investigations. It can also simultaneously acquire other physiological signals, such as temperature, respiration rate, heart rate, blood pressure, EMG, and EOG.

The iWorx EEG system consists of a standard 10-20 Electro-Cap with Ag/AgCl electrodes, integrated EEG amplifier/data recorder with inputs for 2 additional biopotential signals (ECG, EMG, EOG, etc.), a built in galvanic skin response (GSR) amplifier, an event marker channel (hand-held push button switch or foot reaction switch) and LabScribe acquisition and analysis software with dedicated EEG module. The iWorx EEG system can be used with most 10-20 standard Electro-Caps for EEG testing.

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System

IX-EEG Data Recorder

The IX-EEG is a 24 Channel Recorder for measuring 20 channels of EEG, two Bio Potential Channels, a GSR Channel and an Event Marker simultaneously from a single human subject.  The EEG is recorded using a 10-20 system EEG cap with silver/silver chloride (Ag/AgCl) electrodes. The recorder is furnished with LabScribe Recording and Analysis Software and connects directly to a USB port on either a Macintosh or Windows computer.

Features:

  • 20 channels of EEG plus additional inputs for ECG/EMG/EOG (x2), GSR and event marker in a small convenient package
  • 24 bit hardware resolution with less than 1 uV of system noise guarantees high quality EEG data
  • Expand the physiologic recording capabilities of the system by synchronizing with other iWorx recorders.
  • Acquire other physiological signals such as temperature, respiration rate, heart rate, blood pressure, EMG, EOG, etc.

Standard 10-20 EEG Electro-Cap System with Ag/AgCl Electrodes

The Electro-Cap is made of an elastic spandex-type fabric with recessed, Ag/AgCl electrodes attached to the fabric. The electrodes on the standard caps are positioned to the International 10-20 method of electrode placement. The medium Electro-Cap will fit approximately 65% of all individuals over the age of 5.

 IX-B3G Recorder

The IX-B3G recording module allows recording of up to three channels of ECG, EMG or EEG as well as  Electrodermal activity (EDA). EDA is also known as skin conductance, galvanic skin response (GSR), electrodermal response (EDR), psychogalvanic reflex (PGR), skin conductance response (SCR), and skin conductance level (SCL).

Software

LabScribe EEG Analysis Module
EEG Software Module
The LS-30EEG Analysis Module for LabScribe software allows investigators to look at EEG data using a number of preset standard EEG montages.  The alpha, beta, theta and delta frequency distribution is calculated for each electrode combination and displayed graphically within the LabScribe EEG interface.  Data can be manually analyzed within LabScribe or segments of ERP data parsed for export to a .txt, .csv  EDF or MatLab file format for further analysis.Features:
  • Includes built-in stimulus presentation/experiment builder software like OpenSesame
  • Play sound, display images or videos as part of predefined experimental protocols
  • Export of data in text, EDF or MatLab format allows for post-processing with many EEG analysis programs
  • Easily view data using a variety of preset montages
  • Calculates and visually displays EEG power in the  alpha, beta, theta, delta bands
  • Integrates with other stimulus presentation experiment builder software such as OpenSesame
 

In addition, data from iWorx Recorders can be acquired with LabView or Matlab or C++ programs using the provided iWorx API.

S-IXSI: iWorx Serial Interface Software for sending serial messages to Labscribe

Experiment builders, such as DirectRT, EPrime, OpenSesame as well as other softwares have the ability to send a message on the serial port.  S-IXSI serial Interface software can be used to listen on the serial port and send messages to LabScribe about events that are happening on the serial port.  This can be used to communicate to Labscribe when a particular image or video is played by the experiment builder.

iWorx serial Utility

Analysis

The analysis capabilities of LabScribe can be extended by using various open source EEG analysis programs such as:

EEGLAB :  EEGLAB is an interactive Matlab toolbox for processing continuous and event-related EEG, MEG and other electrophysiological data incorporating independent component analysis (ICA), time/frequency analysis, artifact rejection, event-related statistics, and several useful modes of visualization of the averaged and single-trial data.

SleepSMG:  an open source matlab user interface for scoring sleep and comparing sleep scores across individuals.

Videos

 

Citations

Papers about EEG using iWorx systems on Google Scholar

Papers about ERP using iWorx systems on Google Scholar

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