Handling multiple events and multiple epochs

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1

Hello everyone,

I am fairly new to MNE and I am trying to extract timeseries from some .set / .fdt files I got from collaborators. Unfortunately it seems they saved them using Matlab EEGLab and I am unable to use Matlab, hence why I use your library (MNE).
Anyway, I’ve tried to read_epochs_eeglab(path_to_set_file) but it returns the following error: RuntimeWarning: At least one epoch has multiple events. Only the latency of the first event will be retained. And inspecting its output returns

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Which does seem weird doesn’t it?

The files are available at the following adress: Unique Download Link | WeTransfer

For the reproductibility I used

  • MNE version: 1.18.0
  • operating system: Ubuntu 22.04.4 LTS
  • Reproducible Python code:
import mne 
raw = mne.io.read_epochs_eeglab(path_to_data+'210_20161207_0002eyesOpen_afterICA.set',verbose=True) # This results in the warning above
mne.find_events(raw, stim_channel='T8') # Results in an error, very likely related to the problem I'm mentioning

Thanks in advance!
Best,
P.

3

Hello,

It doesn’t really seem weird. It’s just a warning which lets you know what an epoch has multiple events and that it will only consider the first one for the t0/tf time range.

mne.find_events can be applied on Raw to find events, not on Epochs, hence the error.

Mathieu