<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">The most common event-related preprocessing is baseline correction for each event (in your case, 100ms baseline correction unique to each 1000ms epoch) -- at least, in my review of event-related imaging.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Thu, May 29, 2014 at 3:55 AM, KatrinH Heimann <span dir="ltr"><<a href="mailto:katrinheimann@gmail.com" target="_blank">katrinheimann@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hey together,<div>another rather conceptual question: </div><div>I am wondering about the baselinecorrection for the frequencyanalysis. </div><div>I want to compare two timeperiods of one second each, lying right after each other. </div>
<div>In the preprocessing I have baseline corrected them using 100 ms before the first piece (last part of a fixationcross period).</div><div>Do I use the same part for the frequencyanalysis? Will say, do I run the analysis let's say from -0.5 (0 point is end of fixation cross) to 2.5 s, correcting with [-0.1 0] and then extract the two different conditions by statistical extraction (each 1 second long) ? Or do I run two analysis on (a bit more than) one second each, using the whole trial as baseline? </div>
<div><br></div><div>thanks a lot for your advice again! Best</div><div>Katrin</div></div>
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