[Eeglablist] How to change FFT parameters?

[Arnaud Delorme]

Dear Julia,

if you use the 'psd' option of the std_spec function, it will uses the spectopo function to compute spectrum which itself uses the Welch method. You can add any parameters that this function uses to std_spec and it will be passed on to spectopo. In your case, you might want to use the "overlap" parameter. I have clarified the help message of the std_spec function.

Hope this helps,

Arno

On Mar 4, 2014, at 7:24 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:

> Dear Arno,
> 
> Can we edit a taper length with pwelch?
> 
> Makoto
> 
> 
> 2014-03-03 9:28 GMT-08:00 Julia Kam <kamjulia at gmail.com>:
> Hello all,
> 
> I have a question concerning FFT and would greatly appreciate some guidance. I would like to implement a FFT with the following options: Hanning window, 10% taper length. 
> 
> Ultimately, I will be comparing the power values between two groups. Thus far, I set up a STUDY design, and have precomputed channel measures. I've gone over many EEGLAB wiki pages but I can't seem to find any GUI options or command lines that allow me to select the aforementioned parameters when running a FFT. The only piece of relevant information I came across concerns how the default setting uses Welch's window?
> 
> Any help/directions would be much appreciated! Thank you in advance.
> 
> Best regards,
> Julia
> 
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> -- 
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego

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