daviddwlee84 / eegviewer

Electroencephalography signal analysis and visualization

EEGViewer

Electroencephalography signal analysis and visualization

This toolbox has been used in course "Design and Practice of Neuromarketing Experiment (腦科學行銷實驗設計與實作)" in NTUST (Taiwan Tech).

Demo

Basic Usage

Simple procedure

1. Input Data

   • Now support regular *.edf and OpenBCI format *.txt

   viewer = EEGViewer('path/to/your/data.edf');

   or

   viewer = EEGViewer();
   viewer.Load('path/to/your/data.edf')

2. Filtering (Optional)

   viewer.FIRfiltering(1, 30); % Band-pass FIR filter of 1~30 Hz

3. Re-Reference (Optional)

   viewer.AverageReReference();

4. SetMinDrop / SetMaxRange (Optional)

   viewer.SetMinDrop(minimum) % Default is 0 (don't drop)

   viewer.SetMaxRange(maximum) % Default is the maximum of all channel's FFT data

5. SetCompressConstant (Optional)

   viewer.SetCompressConstant(constant) % Default is 1 (don't compress)

   Only use it when you want to compress the graph down (i.e. expand the limit of Z-axis).

6. Static Plot

   viewer.PlotSingleSignal(channel)                % Plot single signal spectrum
   viewer.PlotDoubleSignal(channel1, channel2)     % Plot two signal spectrum symmetrically

7. Animated Plot Setting (Optional)

   viewer.SetAnimateMaxLength(minutes) % Show only the range of the time period on screen

8. Animated Plot

   viewer.AnimatedDoubleSignal(channel1, channel2, speed) % Plot animated two signal symmetrically. (default speed is 2)
   viewer.AnimatedMultipleSignal(channelList, speed) % Plot all animated signal in channelList (must be even number, default speed is 2)

9. Slider Double Singal Plot

   viewer.SliderDoublePlot(channel1, channel2, secLength) % Show only the range of time period on screen

   Ps. It share the animatemaxlength global variable and same setting of Animated Plot function in AddAuxiliaryInformation for now.

10. Slider Multiple Double Signal Plot

    viewer.SliderMultiplePlot(channelList, secLength) % Show only the range of time period on screen

• Quick view of data

  viewer.ScrollView()

• Add channel location name (for OpenBCI) (Optional)

  viewer.SetChannelLocationName('ch1', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7', 'ch8')

• Save FFT data as CSV

  This will output 1~60Hz fft data and sum of delta, theta, alpha, beta, gamma.

  viewer.SaveCSV('filename') % It will auto append .csv extension after filename.

• Statistics CSV

  Output the following statistics with its value and formula (as filename_stat.csv)

  • Right frontal cortical asymmetry (alpha)
  • Frontal brain asymmetry
  • EEG alpha synchronization
  • Posterior resting state EEG asymmetries
  • Approach-Withdrawal (AW) Index
  • Frontal Alpha Asymmetry

  And GFP_theta table (as filename_gfp.csv)

  % [left channel nums; right channel nums]
  viewer.Statistics('filename', [1, 2, 3, 4; 5, 6, 7, 8]) % With only LRChannels
  viewer.Statistics('filename', [1, 2, 3, 4; 5, 6, 7, 8], [1, 2, 3; 5, 6, 7]) % With LRChannels and GFPLRChannels

• Top-N Differential

  Print the top-N absolute value of differential for each channel

  viewer.DifferentialTopN(N)

Other function used

• readOpenBCItxt.m - load *.txt output from OpenBCI's machine
• read_edf.m - *.edf data loader

from EEGLAB

• eegfilt.m - FIR Filter
• eegplot.m - Scroll view on raw data
• textsc.m - Places text in screen coordinates
• fastif.m - Fast if

Popular Matlab Toolbox

EEGLAB

• EEGLAB
• Wiki Tutorial

BCILAB

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• BCILAB

ERPLAB

• ERPLAB

FieldTrip

• FieldTrip

Related Links

OpenBCI

• OpenBCI Documentation
  • Doc Github
  • 3rd Party Software - Matlab

Python EEG

• Pbrain repository

Previous Version Demo