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Getting to know EEGLAB

Install EEGLAB, open your first dataset, and meet the place your data lives: the EEG structure.

6 lessons: 3 core, 3 recommended

After this station you can:

  • Install EEGLAB and add a plugin
  • Open and browse eeglab_data.set
  • Read channel count, sampling rate and events from EEG

Lessons

  1. Installing EEGLAB & pluginsCore12 min
  2. The EEGLAB window & menusCore12 min
  3. The EEG structureCore12 min
  4. ALLEEG & dataset managementRecommended10 min
  5. .set and .fdt filesRecommended8 min
  6. Merging & selecting dataRecommended12 min

Test yourself

4 questions. Your score stays with you and isn't sent anywhere.

1. You need the Biosig plugin to read an EDF file. Where do you install it inside EEGLAB?
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The correct answer: File > Manage EEGLAB extensions

The extension manager is in the File menu: search for Biosig and click Install/Update; it needs an internet connection. Edit > Preferences holds EEGLAB options, not plugins.

Review the lesson: Installing EEGLAB & plugins

2. The command size(EEG.data) prints 32 30504. What do the two numbers mean?
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The correct answer: 32 channels, and 30504 samples per channel

In EEGLAB channels are rows and samples are columns. So EEG.data(1, :) is the whole first channel, and EEG.data(:, 1) is all channels at the first sample.

Review the lesson: The EEG structure

3. Which statements about the fields of EEG are true? (Select all that apply)
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The correct answer: EEG.srate is the sampling rate in Hz, EEG.event(1).latency is the event time in samples, not seconds, EEG.trials = 1 means continuous data

EEG.times is in milliseconds, while EEG.xmin and EEG.xmax are in seconds. EEG.icaweights stays empty until you compute ICA in station 4. To convert a latency to seconds: (sample number − 1) ÷ sampling rate.

Review the lesson: The EEG structure

4. In the main window: Frames per epoch = 30504, Sampling rate (Hz) = 128, and Epochs = 1. About how long is the recording?
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The correct answer: 238 seconds, about 4 minutes

Frames per epoch is a sample count, not seconds. Divide it by the sampling rate: 30504 ÷ 128 ≈ 238 seconds, roughly the number on the Epoch end (sec) line.

Review the lesson: The EEGLAB window & menus