Elektra Beckum NM20600A-A manual MCE User’s Guide

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MCE User’s Guide

Selecting the data ﬁle and pre-processing

In practice, you should ﬁrst specify the baseline period and then press the [Automatic] button, and then add bad channels that are not included. Because the selection of the bad channels slightly affects the projections and the projec- tions affect the selection of the noisy channels, resetting the projections repeat- edly may result in different channels being marked bad at the second time, if their noise levels are near the limits.

A handy way of screening for possible bad channels is to open the MEG Data dialog (p. 26) by pressing the [Show all] button. All the channels will be shown, overlaid based on the location. If one of the waveforms seems to be an outlier, right-click it at the time of the maximum difference, and the channel ID is shown.

NM20600A-A

2004-05-17

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Contents MCE User’s Guide Copyright and Warranty Contents Index Hazard Information IntroductionReferences VersionWhat’s new? Conventions and typographyQuitting the program Getting StartedAnalyzing data Selecting the data ﬁle and pre-processing Setting the ﬁltering and baselinesEffect of the baselines Decreasing the computing time and ﬁle sizesBad channels and projections MCE User’s Guide BEM selection Selecting the head modelPoint set selection dialog Point set selectionMin dist Creating BEM ﬁlesCalculating the estimates Loading a calculated estimate Selecting the time Region of interest What is ROI?What is the orientation of a ROI? Exporting ROIs Selecting a ROIROI database Predicting MEG waveforms Saving to an image ﬁle PrintingPrinting from the dialog Saving with xgifdump command Creating Html documents Creating Html documents and Mpeg moviesCreating movies Window menus MCE windows and dialogsOptions menu Main windowMinimum norm estimate options dialog Pre-processing dialogPre-processing dialog Units Hz Remove mean MEG data dialogSelect ﬁle Full calculation dialogCalculation Batch jobs windowColor display of the estimate Color displayArrow display of the estimate Arrow displayAmplitude window with total activity Amplitude windowAmplitude scale window Amplitude scale windowColor scale window Constant color modeRelative color mode Region of interest window Things to rememberROI database ROI database windowROI list ROI searchSQL database Current ROIOther controls Html Creation Dialog Html Creation DialogTime periods Movie Creation DialogWindow length Index MCE User’s Guide