<html><head><base href="x-msg://2037/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">hi jason,<div><br></div><div>it may be that you are rejecting too much, i.e. removing too much relevant brain activity. in general with regards to blinks and horizontal eye movements (your main sources of ocular artifacts) you should reject ~2, not (significantly) more. have you confirmed that your method is not too liberal in detecting "artefact components"?</div><div><br></div><div>since the time-course and topography of these artefacts are so clear, "visual inspection" may be your best friend.</div><div><br></div><div>good luck!</div><div>nathan</div><div><br></div><div><br><div><div>On 26.10.2011, at 16:38, Jason Chan wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="DE" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Hi Everyone,<o:p></o:p></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US">I am currently using Fieldtrip version 20111009. <o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US"><o:p> </o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US">I am trying to use ICA to reject EOG artifacts. I ran a correlation between my EOG electrodes and MEG components to find the components that should be rejected. This variable I called “toreject”, then used the following function:<o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US"><o:p> </o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: 'Courier New'; color: black; ">cfg = [];</span><span style="font-size: 12pt; font-family: 'Courier New'; "><o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; ">cfg.component = toreject;</span><span lang="EN-US" style="font-size: 12pt; font-family: 'Courier New'; "><o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; ">data_reject = ft_rejectcomponent(cfg, comp);</span><span lang="EN-US" style="font-size: 12pt; font-family: 'Courier New'; "><o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; "><o:p> </o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; ">When I try to plot my data using<span class="Apple-converted-space"> </span></span><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; ">ft_topoplotER, the brain activity looks ‘spotty’. However, when I add the cfg.component back into the cfg structure the activity looks correct. I have also noticed that adding this cfg.component will change the plots after I use MEGplanar and CombinePlanar. What am I doing wrong?<o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; "><o:p> </o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; ">Thank you in advance<o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US" style="font-size: 10pt; font-family: 'Courier New'; color: black; ">Jason<o:p></o:p></span></div></div>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl" style="color: blue; text-decoration: underline; ">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" style="color: blue; text-decoration: underline; ">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></div></span></blockquote></div><br></div></body></html>