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This chapter focuses on the imaging (or distributed) method for implementing EEG/MEG source reconstruction in SPM. This approach results in a spatial projection of sensor data into (3D) brain space and considers brain activity as comprising a very large number of dipolar sources spread over the cortical sheet, with fixed locations and orientations. This renders the observation model linear, the unknown variables being the source amplitudes or power. Given epoched and preprocessed data (see chapter 12), the evoked and/or induced activity for each dipolar source can be estimated, for a single time-sample or a wider peristimulus time window.