[Homer-users] Power spectral density

[Blanca Marin Bosch]

Hi Meryem,

Yep that helps, thanks!

Best,
Blanca

2014-12-03 20:59 GMT+01:00 Meryem Ayse Yucel <mayucel at nmr.mgh.harvard.edu>:

> Hi Blanca
>
> It shows the strength of a signal at different frequencies. You can choose
> one channel's raw data at eg 830 nm (or the wavelength you have). The
> easiest thing to look first in the power spectrum is the frequency of
> heart rate which should be around 1 Hz. If your signal is good, you will
> observe a peak around 1 Hz. You can also observe its second (eg for heart
> around 2 Hz) and third harmonics if your sampling rate is high. You can
> also look for the power of lower frequency oscillations (respiration etc).
>
> Hope this is helpful.
>
> Meryem
>
> > Dear all,
> >
> > Just one quick question: what does the power spectral density plot show?
> I
> > can get the graph but I'm afraid I don't know how to interpret it...
> > Sorry if this is a stupid question!
> >
> > Thank you!
> > Blanca
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