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← Revision 114 as of 2022-08-22 14:15:26 ⇥
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| = Tutorial: Scouts = This tutorial is based on Sabine Meunier's somatotopy experiment, called ''TutorialCTF ''in your Brainstorm database. A ''scout ''in Brainstorm designates a region of interest on the cortical surface. It is defined by a subset of the vertices of this surface.This document will explain how to create one or several scouts, use them to retrieve the activity of specific parts of the brain, and compare between conditions. <<TableOfContents(2)>> == Creating a scout == Almost all the features related to the scouts manipulation are accessible in the Scouts tab in main Brainstorm window. We are going to use this panel to create a scout that includes the cortical area that we observed in the previous tutorial: the one that responds to the stimulation of the right thumb. === First vertex (seed) === 1. Select the protocol ''TutorialCTF'', and display the times series for ''Subject01 / !StimRightThumb / ERP'' (double-click). 1. Display the associated sources (try it from the time series figure: Ctrl+S, or figure popup menu) 1. Go to 46ms, and set the data threshold around 80%. 1. Switch to the ''Scouts'' tab, click on the first button (a big cross), and then click in the middle of the red stain in left hemisphere in the 3D figure (rotate and zoom before if necessary). A small dot with the labe "1" appears where you clicked. Your first scout is created, and contains only one vertex for the moment. It is now referenced in ''Available scouts'' list.<<BR>><<BR>> {{attachment:panelScouts.gif}} - {{attachment:scouts1.gif}} 1. Click on the second button in the ''Scouts ''panel toolbar, tooltip: ''Display scouts time series''. And you will get the time course of this particular source for the whole time window (-50ms to 250ms).<<BR>><<BR>> {{attachment:scoutsTS1.gif}} === Growing a scout === In this case, the source is so focal that we could even use only the first vertex we selected to represent this area. But most of the time, the aim of a scout is to get the average activity of a larger region; so for the example, let's grow this scout. |
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