<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Erika,<div><br></div><div>this is a good question. The scalp topographies of the components showed in pop_spectopo are topographies depicting power (squared version of the component topographies in the time domain -- such as in topoplot and pop_prop). The topographies in topoplot and pop_prop should be the same though. The component topographies showed in envtopo can have their polarity inverted based on the polarity of their ERP when compared to topoplot and pop_prop. You might want to look at the EEGLAB tutorial for more details.</div><div><br></div><div>Best regards,</div><div><br></div><div>A. Delorme</div><div><br><div><div>On Apr 30, 2012, at 2:12 PM, Erika Nyhus wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">I am trying to choose ICA components for further analysis. First, I use pop_topoplot to see all components. Second, I use pop_spectopo to look at which components contribute to the times, frequency band, and channels I am interested in. Finally, I use pop_prop to see the component properties of the component I chose based on the previous step. The figures from each of these steps show different topographies for the same component. What are the units for each of these plots? <br clear="all">
<div><br></div>-- <br>Erika Nyhus, Ph.D.<br>Cognitive, Linguistic, and Psychological Sciences<div><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"><div>Brown University </div>190 Thayer St.<div>
<div>Providence, RI 02912-1821</div></div></span></div><br>
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