<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Dear Flavia,</div><div><br></div>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.<div><br></div><div>This option allows to make subjects power spectrum more similar so if you have outliers it might be a good idea to try it.</div><div>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.</div><div><br></div><div>Best,</div><div><br></div><div>Arno</div><div><div><br><div><div>On 13 Dec 2012, at 12:35, Makoto Miyakoshi wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">Dear Arno,<div><br></div><div>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?</div><div><br></div>
<div>Makoto<br><br><div class="gmail_quote">2012/12/13 Flávia S Belham <span dir="ltr"><<a href="mailto:flaviasb@uol.com.br" target="_blank">flaviasb@uol.com.br</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">Hello! <br>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. <br>
I would like to know in which case I should use that “Subtract…” option, or if I should use it at all.<br>Thank you.<br><div>Flávia S. Belham<br><br><strong><font color="#666666" style="">Flávia Schechtman Belham</font></strong></div>
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-- <br>Makoto Miyakoshi<br>JSPS Postdoctral Fellow for Research Abroad<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br><br>
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