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FIG 2. Cortical activation obtained during tactile stimulation of the right hand. Left hemisphere on the right.
A, Coronal image obtained from an SPGR T1-weighted sequence (100/12/1) on which regions activated during tactile stimulation (obtained from a single-shot echo-planar sequence [3000/60/1]) have been superimposed. This image shows activation foci in the parietal operculum of the contralateral (box 4) and ipsilateral (box 5) hemispheres. In each hemisphere the activated region lay in the upper bank of the sylvian sulcus, presumably corresponding to SII.
B, Coronal image (the same shown in A) obtained from an SPGR T1-weighted sequence (100/12/1), without activation foci or ROIs, to show the sylvian sulcus (SS).
C, Graphs show the signal increase in the contralateral (graph 4, green) and ipsilateral (graph 5, purple) activated cortical regions. The x and y axes represent the same scales as described for figure 1. In the two 30-second stimulation periods, the signal exceeded baseline by 2% to 3%.
D, Axial image, obtained from a subsequent acquisition during the same experimental session, shows the activation foci in the parietal operculum, in a region most likely corresponding to SII. ROIs indicated by boxes 6 and 7 are from contralateral and ipsilateral hemispheres, respectively.
E, Graphs 6 (green) and 7 (purple) show the signal changes in corresponding ROIs 6 and 7 selected in D.
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