<span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; white-space: pre-wrap; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Dear Nancy
I think that it is better to remove artifacts before epoching...This doesnt mean that the application of ICA in epochs (with proper length) is wrong...But i cant find a reason to run ICA (for artifact rejection purposes) many times in all epochs when you can clean the signals in a single run... On the other hand an epoch it is possible to be clean from eye-blinks so ICA will not give you an observable artifactual component...that doesnt mean that some components are not artifactual...
For your secong question you dont tell us exactly why you want to do that...because ICA gots an out of memmory message in long term data??? If that happens you can choose another BSS algorithm for the separation procedure...Try to use JADE or ACSOBIRO which are both implemented in EEGLAB and you can find them in runica function.</span><div>
<font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="white-space: pre-wrap; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px;"><br></span></font></div><div>
<span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; white-space: pre-wrap; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">I hope to helped you...
</span><br><div class="gmail_quote">2010/1/11 qiweijingwx <span dir="ltr"><<a href="mailto:qiweijingwx@126.com">qiweijingwx@126.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>Dear All,</div>
<div>I want using ICA to remove noise such as eye movement, muscle movement et al. in </div>
<div>eeglab. I have two questions about this process. </div>
<div>First, which seems better, running ICA to remove noise before or after epoch the data?</div>
<div>Second, if I want to remove artifacts before epoching data, but the file after merging is too big, could I remove noise separately in each file, then merge them together?</div>
<div> </div>
<div>Thanks in advance!</div>
<div> </div>
<div>best nancy</div>
<div> </div>
<div>2010/01/11<br><br></div>
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