Hi Mariana,
As per my understanding, the question is how to find the dB values that are shown in EEGLAB’s time-frequency analysis plots from a .mat file.
If you have performed time frequency analysis, there must be a variable called esrp. The .mat file will only have an ersp variable if time-frequency (ERSP) analysis was performed and saved. Check the variable list in your .mat file for ersp or similar variables, and use the corresponding frequency and time axes to interpret the dB values. If ersp is missing, you may need to run the time-frequency analysis in EEGLAB and save the results.
Hope this helps!
