[Eeglablist] Preprocess a Group Study

Delorme, Arnaud adelorme at ucsd.edu
Fri Sep 3 09:52:32 PDT 2021

Dear Chanda,

The error is because you cannot compute ERSP for continuous data. ERSP (Event-Related Spectral Perturbation) requires events and time-locked data, which is not your case.
You can compute the spectrum though,


> On Sep 2, 2021, at 5:25 PM, Chanda Steven via eeglablist <eeglablist at sccn.ucsd.edu> wrote:
> Dear All,
> I am preprocessing a lot  (1000+) of qeeg data in edf format with eeglab on
> Matlab,  each subject has a unique file with events in the .txt file that I
> am merging with the subjects edf file and preprocesses the data to obtain
> the time-frequency plot (ERSP and ITC) for developing a machine learning
> model.
> The problem is that I can not create a group study due to subjects having
> different events and that is causing an error "Some datasets have only one
> trial, cannot compute ERPimages" when plotting the time-frequency (ERSP and
> ITC).  Is there a way that  I can use to preprocess a group of subjects at
> the same time and plot the time-frequency in Matlab or any python
> algorithm that I can use in MNE, I tried using MNE with python but
> importing events file and merge it with the edf and select only events of
> interest was a bit challenging. Any advice on this problem would be
> appreciated?
> Thank You,
> Chanda Simfukwe.
> -- 
> Chanda Simfukwe
> Ph.D. Candidate
> Artificial Intelligence and Data Science,
> Chung-Ang University Dept. Medicine,
> The Korea Republic of.
> ..........................................
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