DSPPeriodogram and coherence in frequencies <1Hz

Hello all,

I was wondering if anyone knows of a way to set the frequency resolution of DSPPeriodgram function? I'm trying to look at coherence of an EEG signal across different brain regions, and how this changes in a model of dementia. However, I'm interested in a slow oscillation that peaks around 0.2 to 0.8Hz, so ideally I would be able to resolve coherence in 0.2 to 0.25 Hz bins, which I can't seem to do with the DSPPeriodgram function.

Thanks in advance!

DSPPeriodogram is based on FFT so the same logic applies with respect to sampling rules: you determine the frequency range and resolution through the number of points and the wave scaling of your input arrays.  You can find a discussion of this in the manual under Analysis/FFT.