<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi Daniel,</div><div><br></div>it is also possible to perform high pass filtering at 0.5 Hz (or lower). <div>Best,</div><div><br></div><div>Arno<br><div><br><div><div>On May 18, 2011, at 7:39 AM, Baris Demiral wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi Daniel,<div><br></div><div>One thing you can do is to take the whole trial epoch for base-line as we do before ICA.</div><div>Another thing might be to take the difference between the amplitude of the 1s duration post-response from the 1s duration pre-trial interval, and subtract the difference form the whole epoch. Or, sum them up and divide into two. That way you can normalize to the both "ends".</div>
<div><br></div><div>Best,</div><div>Baris<br><br><div class="gmail_quote">On Sat, May 7, 2011 at 12:24 PM, Levy Daniel <span dir="ltr"><<a href="mailto:daniel.levy@idc.ac.il">daniel.levy@idc.ac.il</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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<div><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Esteemed colleagues,</span></font></p><div><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> </span></font><br class="webkit-block-placeholder"></div><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">We are running a working memory experiment in which each trial involves a number of judgments on a stimulus that is only presented once, such that trial length
(from a cognitive perspective) is up to 20 sec. Baseline EEG preceding the trial does not seem to be appropriate for normalizing EEG recorded at the end of the trial. On the other hand, since information is being actively maintained in WM during the whole
trial period, using intermediate epochs such as fixations does not seem proper either. We are thinking of using a baseline starting 1 sec after the final response of the trial, i.e., the time immediately preceding the beginning of the following trial, to normalize
the last EEG segment before that final response of the preceding trial. Is that problematic?</span></font></p><div><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> </span></font><br class="webkit-block-placeholder"></div><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Thanks for your advice,</span></font></p><div><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> </span></font><br class="webkit-block-placeholder"></div><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Daniel Levy</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"></span></font></p><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">The Interdisciplinary Center</span></font></p><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Herzliya</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">,
Israel</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"></span></font></p>
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