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<div>There was a topic on here in the past about highpass filters and connectivity. It's because the filter uses the future of the signal to calculate the past (or something).</div>
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<div>I detrend before ICA for sure.<br>
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On 7 Aug 2014, at 1:07 pm, "bjj2909102003" <<a href="mailto:bjj2909102003@163.com">bjj2909102003@163.com</a>> wrote:<br>
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<div><span></span>Thank you. But I don't know when the detrend function is used (after run ICA)??And in my view, removing linear trend is equal to high-pass filter.</div>
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<div><span>bjj2909102003</span></div>
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<div><b>From:</b> <a href="mailto:tyler.grummett@flinders.edu.au">Tyler Grummett</a></div>
<div><b>Date:</b> 2014-08-07 08:28</div>
<div><b>To:</b> <a href="mailto:bjj2909102003@163.com">bjj2909102003</a></div>
<div><b>CC:</b> <a href="mailto:marco.buiatti@gmail.com">Marco Buiatti</a>; <a href="mailto:eeglablist@sccn.ucsd.edu">
eeglablist</a></div>
<div><b>Subject:</b> Re: [Eeglablist] ICA and eye blink component</div>
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<div>Just remember that if you band pass before ICA you can't do directional connectivity with the ICs.</div>
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<div>I've found using SIFT's detrend function is a good alternative.</div>
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<div>Good luck!<br>
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Tyler</div>
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On 7 Aug 2014, at 2:25 am, "bjj2909102003" <<a href="mailto:bjj2909102003@163.com">bjj2909102003@163.com</a>> wrote:<br>
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<div><span></span>Thank you for replying.</div>
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<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)
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<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>
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<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>
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<div><span>bjj2909102003</span></div>
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<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>
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<div dir="ltr">Dear Booer,
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<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>
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<div>ADJUST works well only if the ICA is computed on clean enough data.</div>
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<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>
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<div>On removing blinks with ICA: Jung, T.-P., et al. (2000). Removing electroencephalographic artifacts by blind source separation. Psychophysiology, 37, 163–178.</div>
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<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>
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<div>Hope this helps,</div>
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<div>Marco</div>
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<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>
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<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>
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<div>Thanks so much!</div>
<div>Booer</div>
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