<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Andre,<div><br></div><div>yes, you should remove baseline, but you should be careful that the baseline length is long enough. According to an unpublished study by David Groppe, if the baseline is too short (~100 ms) ICA component reliability degrades critically. This is because you are introducing non-linearity by removing the baseline (if there are common generators that could be isolated by ICA and project linearly to each channel, you are making it harder for ICA by subtracting a constant from each channel activity - since this common source cannot project linearly to all channel any more).</div><div><br></div><div>I would personally recommend a baseline period of 1 second.</div><div>Hope this helps,</div><div><br></div><div>Arno</div><div><br><div><div>On 7 juil. 08, at 16:32, Andre Cravo wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hello,<br> <br>I would like to run ICA in epochs instead of the whole dataset. To do so, should I remove the baseline of the epochs before running the ICA? <br><br>Thanks in advance,<br><font color="#888888"><br>Andre</font><br clear="all"><br>-- <br>Andre M. Cravo<br>Ph.D. Student<br>Roberto Vieira Laboratory of Sensory Physiology<br>University of São Paulo<br> <a href="http://www.fisio.icb.usp.br/~vinicius">www.fisio.icb.usp.br/~vinicius</a> _______________________________________________<br>Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br>To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a><br>For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a></blockquote></div><br></div></body></html>