[Eeglablist] Reg Spectral Analysis

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Oct 20 16:16:06 PDT 2014

Dear Nishanth,

Read slide 21 of this file and you'll see how to set the parameters for



On Sun, Oct 19, 2014 at 6:39 PM, nishanth reddy <nishanth.reddy56 at gmail.com>

> Hello All :
> I apologize for consistently asking the same question. I'm trying to
> extract the power of all the frequency in a particular epochs and would
> like to know the dominating frequency in the epoch by performing the power
> spectral analysis and by plotting the time-frequency map.
> My data is sampled at 1000Hz. My required window is Hanning and the Window
> length should be 10 seconds , this implies that every epoch has 10000 time
> points.
> I've done the operation in the following steps for a 2 minute recording
> and you can see the corresponding images of my operation.
> /* I loaded the data for 2 min , but worked on 1 min recording */
> *1. I loaded my data (Image-1)*
> *2. I directly went to plot channel time-frequency (Image-2) /** you can
> see what changes conditions I've given in there*/
> *3. I got this output (Image 3)*
> *4. This is what i observed in the command window (Image 4) :*
>         Here I noticed that the minimum frequency was adjusted to 0.6 and
> the maximum frequency was 20.02 (* I actually want 0-20*). It used
> hanning window ,which I actually wanted. But, it says window size used is
> 8192 samples (8192ms) *but, i actually want 10000 samples in a window as
> my window length is 10s.*
> *Therefore, what changes should i make to my parameters so that i get the
> results according to my requirements ?*
> --
> Thanks&Regards
> Nishanth

Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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