Simply EEGLAB

Events

Station 2 · Lesson 3 · EEGLAB 2026.1

In the GUI

PlotChannel data (scroll)
Event types
EditEvent values
latency (sec)duration (sec) type
Cancel

Script

[ALLEEG, EEG, CURRENTSET, ALLCOM] = eeglab;
dataFolder = 'C:\Users\me\Documents\eeg-course';   % change it
EEG = pop_loadset('filename', 'S001R03.set', 'filepath', dataFolder);
eeg_eventtypes(EEG)          % T0 14, T1 8, T2 7
numel(EEG.event)             % 29
{EEG.event(1:4).type}        % 'T2' 'T0' 'T1' 'T0'
[EEG.event(1:4).latency]     % 672 1328 2000 2656
([EEG.event(1:4).latency] - 1) / EEG.srate   % 4.1937 8.2937 12.4938 16.5938
[EEG.event(1:2).duration] / EEG.srate        % 4.1 4.2
pop_eegplot(EEG, 1, 1, 1);

Which value should I choose?

Field	What it stores	Stored unit	Shown in Edit > Event values as	Example (first event)
`type`	Event name	text	text	`T2`
`latency`	When the event happened	samples	seconds	`672` (4.19 s)
`duration`	How long the event lasted	samples	seconds	`656` (4.1 s)
`urevent`	The event's number in the original list	number	not shown	`1`
Check	Expected
Event types	`T0`, `T1`, `T2`
Number of events	29: 14 `T0`, 8 `T1`, 7 `T2` (the first annotation, at 0 s, is removed)
Spacing	about 4.1 to 4.2 seconds between events
Last event	`T1` at about 120.4 seconds, before the end of the recording at 125 seconds

Check

The Events line in the main window shows 29
eeg_eventtypes(EEG) lists T0 14, T1 8 and T2 7
The first event in Edit > Event values is T2 at [4.1937] seconds, and the second is T0 at [8.2937] seconds
The scrolling window shows event lines about every 4 seconds

In the GUI

Script

Which value should I choose?

Check

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