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<div><span></span>Thank you for replying.</div><div><div>Actually, before I run ICA, I only filter the data by bandpass filter. It takes too much time to reject some <span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">non-stereotypical artifacts, especially when I got many subjects(~100) data.</span></div></div><div><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">It is painful by visual inspection one by one. Your advice is good. Nonetheless, I believe ICA is robust in many situations.</span></div><div><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;"><br></span></div><div><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">Thanks!</span></div><div><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">Booer</span></div><hr style="width: 210px; height: 1px;" color="#b5c4df" size="1" align="left">
<div><span>bjj2909102003</span></div>
<blockquote style="margin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;"><div> </div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style="PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b> <a href="mailto:marco.buiatti@gmail.com">Marco Buiatti</a></div><div><b>Date:</b> 2014-08-06 14:53</div><div><b>To:</b> <a href="mailto:bjj2909102003@163.com">bjj2909102003</a></div><div><b>CC:</b> <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist</a></div><div><b>Subject:</b> Re: [Eeglablist] ICA and eye blink component</div></div></div><div><div class="FoxDiv20140806151010509273"><div dir="ltr">Dear Booer,<div><br></div><div>blinks are usually well identified by ICA. You may not easily identify blinks if:</div><div>1) your subject blinks really a few times -> not enough for being captured by ICA, you may just discard the few epochs containing the blinks;</div>
<div>2) when your subject blinks, s/he moves so much that the relative artifact spreads over most sensors, and ICA is not able to capture it in a few clear components -> Also in this case my advice is to discard the epochs containing the blinks;</div>
<div>3) you are computing the ICA on noisy data -> reject segments of your data containing non-stereotypical artifacts and compute the ICA again.</div><div><br></div><div>ADJUST works well only if the ICA is computed on clean enough data.</div>
<div><br></div><div>Refs:</div><div>On blinks: Croft, R., & Barry, R. (2000). Removal of ocular artifact from the EEG: A review. Clinical Neurophysiology, 30, 5–19.<br></div><div><br></div><div>On removing blinks with ICA: Jung, T.-P., et al. (2000). Removing electroencephalographic artifacts by blind source separation. Psychophysiology, 37, 163–178.</div>
<div><br></div><div>On removing blinks with ADJUST: Mognon A, Bruzzone L, Jovicich J, Buiatti M, ADJUST: An Automatic EEG artifact Detector based on the Joint Use of Spatial and Temporal features. Psychophysiology 48 (2), 229-240 (2011).</div>
<div><br></div><div>Hope this helps,</div><div><br></div><div>Marco</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On 5 August 2014 08:53, bjj2909102003 <span dir="ltr"><<a href="mailto:bjj2909102003@163.com" target="_blank">bjj2909102003@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;"><div>
<div><span></span>Hello,</div><div>I want to use ICA to reject eye blink. But for some subjects it is easy to find eye blink component, for others it is hard to find blink component even I use the plugin-ADJUST. So does ICA <span style="background-color:rgba(0,0,0,0)">extract</span> eye blink component without fail??</div>
<div><br></div><div>Thanks so much!</div><div>Booer</div><hr style="width:210px;min-height:1px" color="#b5c4df" size="1" align="left">
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-- <br>Marco Buiatti, PhD<br><br>CEA/DSV/I2BM / NeuroSpin<br>INSERM U992 - Cognitive Neuroimaging Unit<br>Bât 145 - Point Courrier 156<br>Gif sur Yvette F-91191 FRANCE<br>Ph: +33(0)169.08.65.21 <br>Fax: +33(0)169.08.79.73<br>
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