[Eeglablist] Question Subtract individual mean

[Arnaud Delorme]

Dear Flavia,

removal of the mean is controlled by pairing properties in your design. The mean is removed within a single subject which data is paired. The information appears on the command line.

This option allows to make subjects power spectrum more similar so if you have outliers it might be a good idea to try it.
There is no rules for using or not using it though. It is up to the user to choose which procedure is most appropriate for his/her data.

Best,

Arno

On 13 Dec 2012, at 12:35, Makoto Miyakoshi wrote:

> Dear Arno,
> 
> Flavia's question is understandable. What is 'subject mean' in “Subtract individual subject mean spectrum” ? Is it a mean spectrum across all ICs or conditions?
> 
> Makoto
> 
> 2012/12/13 Flávia S Belham <flaviasb at uol.com.br>
> Hello! 
> I have a question about an option on the “Set spectrum plotting parameters” gui. I really cannot decide whether or not to check the “Subtract individual subject mean spectrum” box. There are two analyses that I want to do. The first one is to compare scalp frequencies between four conditions of a task. The other is to compare scalp frequencies between groups (men X women and young X elder people) of subjects. 
> I would like to know in which case I should use that “Subtract…” option, or if I should use it at all.
> Thank you.
> Flávia S. Belham
> 
> Flávia Schechtman Belham
> 
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> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
> 

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