[Eeglablist] ERSP outputs

[Makoto Miyakoshi]

Dear Erika,

See this description from newtimef() help.

        'padratio'  = FFT-length/winframes (2^k)                    {default:
2}
                      Multiplies the number of output frequencies by
dividing
                      their spacing (standard FFT padding). When cycles~=0,
                      frequency spacing is divided by padratio.

You have 3-125Hz, so you have approx. 125/2 freq bins.

For the output time range, see my slide No. 21 for the explanation.
https://sccn.ucsd.edu/mediawiki/images/a/a6/C2_A3_Time-frequencyDecAndAdvancedICAPracticum_updateJan2017.pdf

Makoto

On Thu, Jun 29, 2017 at 12:18 PM, Erika Nyhus <enyhus at bowdoin.edu> wrote:

> I am confused about the outputs for ERSPs in std_precomp.  My data was
> epoch from -800-2000 ms and the only inputs I set for erspparams was
> 'cycles',  [3 .5], 'padratio', 1.  The output frequencies are 3-125 Hz
> which I believe is the default (3 Hz to sampling rate (250)/2), but I am
> not sure why there are 63 frequencies.  The output times are 200 timepoints
> which I believe is the default, but I am not sure why the times range is
> -240-1440 ms.
>
> --
> Erika Nyhus, Ph.D.
> Department of Psychology and Program in Neuroscience
> 6900 College Station
> Bowdoin College
> Brunswick, ME 04011
>
>


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