How to select multiple channels of time-frequency at EEGLAB?

Why is it not possible to select multiple channels when performing time-frequency analysis within EEGLAB after processing with TESA?

Answer 1

[Prasanna]

Hi Kengo,

To select multiple channels for time-frequency analysis in EEGLAB, you can perform the following steps:

• Load your EEG dataset in EEGLAB and perform required pre-processing.
• Go to Channel time-frequency present in the GUI which will open a dialog when you can specify the channel number. However, the standard EEGLAB interface for time-frequency analysis allows you to select only one channel at a time.
• To select multiple channels, you can run the analysis using ‘pop_newtimef.m’ function in a loop for multiple channels and then plot them together or use the 'ft_multiplotTFR' function from the FieldTrip toolbox if you have it integrated with EEGLAB.

The ‘pop_newtimef’ function is primarily intended for single-channel analysis. Therefore, to analyze multiple channels, run the analysis separately for each channel and combine the results using scripting to automate the process for multiple channels. For more resources, you can refer the following documentations:

• Time-frequency analysis: https://eeglab.org/tutorials/08_Plot_data/Time-Frequency_decomposition.html
• Spectral analysis: https://eeglab.org/tutorials/ConceptsGuide/Time_frequency_tutorial.html
• newtimef.m: https://github.com/sccn/eeglab/blob/develop/functions/timefreqfunc/newtimef.m