= Tutorial 19: Clusters of sensors =
''Authors: Francois Tadel, Elizabeth Bock, Sylvain Baillet''

In EEG, a lot of the analysis can be done directly on the electrodes  values. This tutorial explains how to group sensors in a cluster and  overlay channels from different conditions in the same graph.

In MEG, we tend to avoid working at the sensor level because the signals are ambiguous, we work mostly in the source space, which is the topic of the next tutorials. If you are planning to work only with MEG recordings, you may skip this tutorial.

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== Cluster tab ==
The Cluster tab is not shown by default in the Brainstorm interface. You have first to add it to the interface.

 * Click on the '''[+]''' button next to the Scout tab > '''Add: Cluster'''.<<BR>>If the list of tabs is too busy, you can close some of them in the same way. <<BR>><<BR>>{{attachment:cluster_tab.gif}}
 *

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