title: window size and overlapping in pwelch function of matlab for PSD evaluations
body: <p>Could anyone please suggest ideal Window size and overlapping samples for pwelch function in Matlab. I have several 200 ms EEG signals with sampling rate 1000 (signal length or number of samples = 200) to evaluate spectral power. By default pwelch uses hamming window and divides the data into 8 segments with 50% overlap. Are these default values okay for a signal with only 200 samples? The default values are working fine and its giving me a PSD plot. I want to make sure that what I am doing is conceptually correct and if someone could suggest any better way of doing this? This is a study of ERP response to stimuli in a 200 ms time duration. I want to compare the spectral powers in different frequency bands.</p>
  
  <p>Thanks for the help!</p>