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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Fieldtrip users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It has come to our attention by Philip Ruhnau that when averaging across participants using ft_XXXgrandaverage, due to a bug, no care was taken when the channel-order was different between participants (see http://bugzilla.fcdonders.nl/show_bug.cgi?id=1986). This could occur, for example, when after interpolating channels, the interpolated channels are added to the end of the data and thus changing the channel ordering. Particularly for EEG data this bug could be a problem because often different channels are interpolated for different subjects. No problems should have occurred when merely removing channels.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For MEG data, the same problem occurred when using ft_combineplanar after interpolating, for example, vertical or horizontal channels separately. In this instance the wrong channel pairs were combined. However, if channels were interpolated after using ft_combineplanar, or if pairs of horizontal and vertical channels were removed you should have no problems given that the same channels were affected across all participants. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The bug has been fixed as of rev. 7519. We strongly advise users that have data containing different channel ordering between participants to download the newest version of Fieldtrip and re-check grand averaged data.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Jim<o:p></o:p></p></div></body></html>