Calculate absolute band power in ERP data

💬 Support & Discussions
1

Hi, I have epochs with a length of 1.2 seconds and would like to calculate the theta, alpha and possible also delta and beta band powers. I know there is mne.time_frequency.psd_welch but I have two problems with this:

  1. This returns the power spectral density and not power, I am not sure how I have to go from one to the other
  2. I only get three the results for three frequencies.

I assume this has something to do with the window it uses, but I am not fully confident with all the transformations so I don’t fully get what is going wrong. Is the 1.2 seconds too short to get any meaningfull results? Do I have to do it in another way (TFR using Morlet wavelets and then calculating something from this?)

Thanks in advance!

Edit: I am able to get the TFR Morlet to work and the results look okayish. I am however very confused as to how I should interpret the values on these plots. For instance, what units do they use? If someone could help me with that as well, that would be greatly appreciated.

2

Hello, I invite you to join us in today’s office hour if you feel like it!

3

Hello, thank you for the invite, but sadly I am unavailable at that moment. I will join the discord group though!