= 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.

<<TableOfContents(2,2)>>

== Cluster tab ==
The Cluster tab is not shown by default in the Brainstorm 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||height="85",width="277"}}
 * The Cluter panel is similar to the Scout tab, but much simpler. It contains a toolbar to create and edit clusters, a list of existing clusters and a few display options at the bottom.<<BR>><<BR>> {{attachment:cluster_panel.gif||height="200",width="224"}}
 * '''[NEW SEL]''': Create a cluster containing the channels that are currently selected in the interface.
 * '''[NEW IND]''': Create a cluster with channels selected by index, name or type.
 * '''[Display clusters time series]''':

 * Display the MEG recordings for the '''standard average''' or '''Run#01''' (double-click on the file).

<<HTML(<!-- END-PAGE -->)>>

<<EmbedContent("http://neuroimage.usc.edu/bst/get_prevnext.php?prev=Tutorials/Colormaps&next=Tutorials/HeadModel")>>

<<EmbedContent(http://neuroimage.usc.edu/bst/get_feedback.php?Tutorials/ChannelClusters)>>