<div dir="ltr">Dear Carolina,<div><br></div><div>if you're fitting dipoles to independent components, data epochs are not used in the dipole fitting process itself. Only the IC scalp maps and the forward model are needed. </div><div>Therefore, the quality of your dipole localization depends on the quality of your ICA, which benefits greatly from having:</div><div>1 - clean data (devoid of non-stereotypical artifacts, don't worry about EMG and EOG)</div><div>2- as much data as possible</div><div><br></div><div>With respect to question 3, local minima are conceptually always possible for the simple reason that you don't scan the entire brain volume at infinite resolution, so there's no way of knowing if a lower objective value might be possible at some unexplored location. </div><div>In practice you shouldn't worry about this though. </div><div><br></div><div><br></div><div>Best,</div><div>Mircea</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 9, 2017 at 4:44 PM, Carolina Pletti <span dir="ltr"><<a href="mailto:carolina.pletti@gmail.com" target="_blank">carolina.pletti@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"><div><div><div><div><div><div>Dear EEGlab community,<br><br></div>I have a few questions regarding Dipfit.<br><br></div>1 - would you recommend fitting the dipoles before or after artifact rejection?<br></div>2 - Is there any suggestions on whether to run it on long (e.g. 3000 ms or more) vs short (e.g. 1000 ms) data epochs?<br></div>3 - what should one do when it finds a local minimum, or when a local minimum is possible? Is it normal that it is <i>always </i>possible?<br><br></div>Thank you very much!<span class="HOEnZb"><font color="#888888"><br><br></font></span></div><span class="HOEnZb"><font color="#888888">Carolina Pletti<br></font></span></div>
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