Hi,
I try to calculate power spectrum of the brain EEG signal. There are 1000 samples, sampling rate is 250. I see a clear 50 Hz in this signal (attached). However, when I do FFT, I cannot see 50Hz but only power in the low frequecnies. What I am doing wrong? I attach my code and mat file.
Thak you a lot for the help!
Alex
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