Figure 4.

Source localization of the difference between the oscillatory responses during the observation of other's pain and other's touch (β ERD, see Fig. 3). Three different source localization approaches were used: Minimum Norm Image (MNI), Multiple Source Beamformer (MSBF), and Classical LORETA Analysis Recursively Applied (CLARA). The results are projected onto a standard MRI in Talairach space. Left panel: MNI. Maximal activity was located at x = 28, y = −25, z = 67 (corresponding to the precentral gyrus, BA 4). Middle panel, MSBF. Maximal activity was distributed over the sensorimotor area, with two maxima. One located at x = 27, y = −9, z = 67 (corresponding to the precentral gyrus, BA 6) and the other located at x = 27, y = −34, z = 67 (corresponding to the postcentral gyrus, BA 2). Right panel, CLARA. Maximal activity was located at x = 20, y = −23, z = 54 (corresponding to the precentral gyrus, BA 4). Note that all three different source analysis approaches support a source located in the sensorimotor cortex, with a peak of activity corresponding to the precentral gyrus. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]