Hi, I have time-series (MER) of a Parkinson patient, the sample frequence is 24000 Hz. I want to estimate the power spectrum density of the spike trains, I used Welch method, it's parameters incuded a Hanning window and a 50% overlap between windows that produced a 0.5 Hz spectral resolution. But i have a problem, i am not sure if i used the right input data, from Matlabs help : [Pxx,f]=pwelch(x,window,noverlap,nfft,fs), i am not sure about fs, it means the sample frequency of MER or something else?