<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Jarang,<div><br></div><div>I think there are two options:</div><div><br></div><div>1.) You exclude as a pair, as combining the two orthogonal sensors you want to capture the different directions of the magnetic field.</div><div><br></div><div>2.) Or you look at the horizontal and vertical gradiometers separately. The following script should allow you to extract the two different sensor types</div><div><br></div><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">channel = ft_channelselection(<span style="color: #b14bf0">'MEG*2'</span>,data.label);</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">index = match_str(data.label,channel);</div><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; min-height: 17.0px"> <br class="webkit-block-placeholder"></p><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradH_F = data;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradH_F.powspctrm(:,1:102,:,:) = data.powspctrm(:,index,:,:);</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradH_S = data;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradH_S.powspctrm(:,1:102,:,:) = data.powspctrm(:,index,:,:);</div><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; min-height: 17.0px"> <br class="webkit-block-placeholder"></p><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">channel = ft_channelselection(<span style="color: #b14bf0">'MEG*3'</span>,data.label);</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">index = match_str(data.label,channel);</div><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; min-height: 17.0px"> <br class="webkit-block-placeholder"></p><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradV_F = data;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradV_F.powspctrm(:,1:102,:,:) = data.powspctrm(:,index,:,:);</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradV_S = data;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 14px/normal Courier; ">gradV_S.powspctrm(:,1:102,:,:) = data.powspctrm(:,index,:,:);</div><div><br></div><div>data is a grand mean time frequency matrix with keep individuals = yes. I hope that helps.</div><div><br></div><div>Best,</div><div><br></div><div>Stephan</div><div><br></div><div><div>El 10/04/2012, a las 11:40, Jarang Hahm escribió:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi all,</div><div> </div><div> </div><div>We are using Neuromag 306 sensors VectorView system.<br></div><div>And only gradiometer sensors (204 sensors) are used for analysis.</div><div> </div><div> </div><div> </div><div>
In the artifact rejection, I excluded four bad sensors, not as a pair, among 204 sensors.<br><br>After time-frequency analysis, I got lost when combine the sensors.</div><div> </div><div> </div><div> </div><div>How can I deal with the data with a single sensor in part?</div>
<div> </div><div>Should I reject the sensor as a pair? Or, combine the signals only for the paired sensors?</div><div> </div><div> </div><div>I want you to suggest the proper way to handle the data of one sensor in a pair.</div>
<div> </div><div> </div><div> </div><div> </div><div>Thank you in advance,<br clear="all"><br> <br></div>
<div> </div><div>Jarang Hahm</div>
<div> </div><div> </div>
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<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-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-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><br class="Apple-interchange-newline">________________________________________________________</div><div>Stephan Moratti, PhD<br><br></div><div>see also: <a href="http://web.me.com/smoratti/">http://web.me.com/smoratti/</a><br><br></div><div>Universidad Complutense de Madrid</div><div>Facultad de Psicología</div><div>Departamento de Psicología Básica I</div><div>Campus de Somosaguas</div><div>28223 Pozuelo de Alarcón (Madrid)</div><div>Spain</div><div><br></div><div>and</div><div><br></div><div>Center for Biomedical Technology</div><div>Laboratory for Cognitive and Computational Neuroscience</div><div>Parque Científico y Tecnológico de la Universidad Politecnica de Madrid<br>Campus Montegancedo</div><div>28223 Pozuelo de Alarcón (Madrid)</div><div>Spain<br><br><br>email: <a href="mailto:smoratti@psi.ucm.es">smoratti@psi.ucm.es</a><br>Tel.: +34 679219982<br><br></div></span></div></span></div></span></div></span></div>
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