Switch to the Scout tab, click on the first button in the toolbar (the big cross). The response is larger in the left hemisphere, so let's start with the left. In the Surface tab, increase the amplitude threshold to see something relatively focal. ![]() Go to the first peak in the response, around 90ms. Open the average recordings for the standard condition, to have a time reference. In Intra-subject, double-click on the normalized standard average. All the surfaces contain, by default, an empty atlas called "User scouts", for the user to create new regions of interest. An atlas can be an anatomical parcellation (like the ones loaded when using FreeSurfer), a random parcellation generated by Brainstorm, or a user-defined list of ROIs. For one cortex surface, we can have as many atlases as needed. The scouts are automatically saved in the surface file from which they are created, and they are loaded and automatically displayed each time the surface is loaded.Īn atlas designates, in this context, a list of scouts. We will start by creating regions of interest corresponding to the auditory cortices to illustrate the tools, then define other regions to better explore the dynamics of the brain response.Īlmost all the features related to scout manipulation are accessible in the Scout tab in the main Brainstorm window. ![]() ![]() According to the literature, we expect to observe at least the following effects:īilateral response in the primary auditory cortex (P50, N100), in both experimental conditions (standard and deviant beeps).īilateral activity in the inferior frontal gyrus and the auditory cortex corresponding to the detection of an abnormality (latency: 150-250ms) for the deviant beeps only.ĭecision making and motor preparation, for the deviant beeps only (after 300ms). With this auditory oddball experiment, we would like to explore the temporal dynamics of the auditory network, the deviant detection and the motor response. For all the brain imaging experiments, it is highly recommended to have a clear hypothesis to test before starting the analysis of the recordings.
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