Hi. I am trying to graph the FFT of a signals file in Brainstorm. When I put in the process the raw file and run: Frequency --> Fourier Transform (FFT). I have these settings and their results.

,
Although there is no error, I wish to watch the evolution of the FFT over time, but I can only watch an instance of the FFT. I can't watch how is changing over time: How can I solve this?