<div dir="ltr">Dear Jose,<div><br></div><div><div><font color="#0000ff">1) Can I do ICA in select periods of time within my epochs?</font></div><div><font color="#000000"><br></font></div><div><font color="#000000">Yes.</font></div><div><font color="#0000ff"><br></font></div><div><font color="#0000ff">2) If not, I could try to re-epoch my dataset, perform ICA in the re-epoched (shorter) dataset, and then re-inject the weight of the ICA back to the original dataset), does that sound ok? I'm only interested in my selected time period of interest, and the rest of the signal I would use it because I need a buffer zone, and because long periods to compute power at low frequencies,</font></div><div><font color="#0000ff"><br></font></div><div><font color="#000000">Yes. But you want to feed ICA with sufficient number of data points, namely ch^2 x 30.</font></div><div><font color="#0000ff"><br></font></div><div><font color="#0000ff">3) Can I epoch relative to two triggers, i.e. for a sequence of triggers: A, B, C, D, E I want to do from -0.5 relative to A until E,</font></div></div><div class="gmail_extra"><br></div><div class="gmail_extra">Yes, you can use any subsample of data for ICA. This can increase its sensitivity to event-related data, but loses data points to learn. That's the trade off.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Mar 3, 2017 at 7:11 AM, José Luis <span dir="ltr"><<a href="mailto:joseluisulloafulgeri@gmail.com" target="_blank">joseluisulloafulgeri@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">hi,<div><br></div><div>I'm analysing EEG data and want to perform ERP and time-frequency analyses,</div><div>I'm doing the pre-processing with EEGlab,</div><div>I wanted to move fast so I epoch my data and then I proceed with the artefact rejection. I epoch my data taken into consideration that for time-frequency I need a buffer zone,</div><div>Now, I want to perform ICA but only in a selected time period of interest. I have several question here:<br></div><div>1) Can I do ICA in select periods of time within my epochs?</div><div>2) If not, I could try to re-epoch my dataset, perform ICA in the re-epoched (shorter) dataset, and then re-inject the weight of the ICA back to the original dataset), does that sound ok? I'm only interested in my selected time period of interest, and the rest of the signal I would use it because I need a buffer zone, and because long periods to compute power at low frequencies,</div><div>3) Can I epoch relative to two triggers, i.e. for a sequence of triggers: A, B, C, D, E I want to do from -0.5 relative to A until E,</div><div><br></div><div>Thanks in advance for your help,</div><div>Jose<span class="gmail-HOEnZb"><font color="#888888"><br clear="all"><div><br></div>-- <br><div class="gmail-m_42089549060621406gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">José Luis ULLOA FULGERI, PhD<br><span><a href="tel:+32%20477%2042%2090%2007" value="+32477429007" target="_blank">+32477429007</a><br>+32<span>4</span>92646477</span><br><a href="https://sites.google.com/site/joseluisulloafulgeri/" target="_blank">https://sites.google.com/site/<wbr>joseluisulloafulgeri/</a><br><span style="border-collapse:separate;color:rgb(102,102,102);font-family:"times new roman";font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:medium"><span style="font-family:arial;font-size:small"><span style="font-family:tahoma,sans-serif"><span style="border-collapse:separate;color:rgb(102,102,102);font-family:"times new roman";font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:medium"><span style="font-family:arial;font-size:small"></span></span></span></span></span></div></div></div></div></div></div></div></div></div></div>
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