MCE User’s Guide | Region of interest |
8.3 Selecting a ROI
You can select a ROI from the Color display (p. 29). Select a range of nodes with the right mouse button.
The program will find the active source points that are contributing to the selected activity and calculate the ROI center and extent. The orientation of the ROI will be the mean orientation of selected currents.
After selecting a new ROI, activity weighted with it is shown in the ROI win- dow (p. 34), the time course of activity in the area is shown in the Amplitude window (p. 31), and the parameters of the ROI are shown in the ROI database (p. 35). In the Color display or Arrow display (p. 30) you can toggle between showing the selected activity and all the activity by pressing any key when the window is selected.
Warning: Region of interest may contain multiple sources whose activities are
! mixed together.
8.4ROI database
You can compare the activity of a certain brain area in different measurements and subjects by saving the ROIs in a database.
You can access the database with the ROI database window (p. 35). When you have selected the ROI corresponding to the interesting brain area, write the name of the area in the [Comment] field and press the [Save] button.
If you want to see the activity of the same area during another measurement, load (p. 12) the corresponding estimate, press down the [Show other files]but- ton, and select the area from the list.
If you compare the results of different subjects and possibly with your col- leagues, you may need to press down the [Show other subjects] button or change the user name in the [Creator] field. If there is a huge number of ROIs in the database, you can constrain the search using SQL search (p. 37).
8.5 Exporting ROIs
You can export the ROI ellipsoids to Mrilab with the [Export new file]and [Append] commands in the [Options] menu of the ROI database window (p. 38). The output files can be imported to Mrilab (see corresponding manual for details).
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