I'm working on MEG recordings and trying to do source reconstruction for frequency data; my experimental design resembles that of an SSVP in that I would need to detect differences in entrainments across conditions - I am not interested in time.
However, after running FFT on each condition file for each subject the time dimension is still considered, which I find extremely confusing.
Two examples are:
(1) by trying to extract specific frequencies for each subject, the files get concatenated on the time domain;
(2) while trying to run a statistical test on the data I need to select a time-window to consider.
Is there a way to drop the time dimension and only keep the frequency information?
Are there other alternatives to analyze only frequency-related information?
Thanks in advance