[Eeglablist] Frequency-time spectrogram deconstruction

[Athif Mohamed]

Hi, 

You can use the EEGLab's built in filtering tools and create new datasets which can be used to plot in both time and frequency domains.

Regards
Athif

-----Original Message-----
From: "Fotiadis, Panagiotis" <Panagiotis.Fotiadis at pennmedicine.upenn.edu>
Sent: ‎07/‎01/‎2019 15:04
To: "eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>
Subject: [Eeglablist] Frequency-time spectrogram deconstruction

Hello,


I am fairly new to EEGLab and I had a question concerning the deconstruction of my EEG signal into its alpha/beta/theta/delta sub-components:


After pre-processing some subjects with EEG data from 128 channels and performing ICA (using runica), I used eeglab and chronux to plot the power/frequency and frequency/time spectrograms of several epochs of interest. 


Is there a way to extract the alpha/beta/theta/delta frequencies of those epochs and quantify when they occur in time? I can visualize when each type of neuronal oscillation occurs by looking at the overall frequency/time spectrogram, but I was wondering whether there was a more robust way to actually plot each type of oscillation separately and/or quantify when it occurs.


Would I just need to bandpass filter my post-processed EEG signal to each frequency range of interest (i.e., alpha: 8-12Hz etc) and then plot the remaining EEG signal over time, or is there another way to do this?


Thank you in advance!


Best,
Panos
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