<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Francesco,<div><br></div><div>I suspect that the 60 Hz line noise is not of constant amplitude throughout the length of your trial (it seems you read in a whole session at once). Having, say, a 5-minute recording, notching out the 60 Hz with a dftfilter leads to a 1/300 Hz wide notch. This is probably too narrow given some slight 60 Hz amplitdue modulations. You could use a bandstop filter in this case.</div><div><br></div><div>Best,</div><div><br></div><div>Jan-Mathijs</div><div><br></div><div><br></div><div><div><div>On Oct 28, 2011, at 10:21 AM, Francesco Di Pompeo wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Dear all,<br><br>I need a 60 Hz notch filter before the ICA of continuous 4D data.<br>I did it using ft_preprocessing but the 60 Hz line is still there..<br><br>Something wrong in my script?<br><br><br>cfg = [];<br>cfg.dataset = '0';<br>cfg.channel = {'MEG', '-A246', '-A170', '-A110', '-A19'};<br><br>cfg.bpfilter = 'yes'; <br>cfg.bpfreq = [1 150];<br><br>cfg.dftfilter = 'yes';<br>cfg.dftfreq = [60 120 180];<br><br>data_meg = ft_preprocessing(cfg);<br><br><br><br><br>-----------------------------------------------------------------<br>Francesco Di Pompeo, PhD<br>Institute of Advanced Biomedical Technologies and<br>Department of Neuroscience and Imaging<br>University of Chieti "G. d'Annunzio"<br>Via dei Vestini - Campus Universitario<br>66013 Chieti - ITALY<br>ph: +39-0871-3556907<br>fax:+39-0871-3556930<br><br><br><br>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip<br></div></blockquote></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); 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; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; 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 style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; 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 style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; 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; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Jan-Mathijs Schoffelen, MD PhD </div><div>Donders Institute for Brain, Cognition and Behaviour, <br>Centre for Cognitive Neuroimaging,<br>Radboud University Nijmegen, The Netherlands</div><div><a href="mailto:J.Schoffelen@donders.ru.nl">J.Schoffelen@donders.ru.nl</a></div><div>Telephone: +31-24-3614793</div></div></span></div></span></div></span></span>
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