Fig. 2. Selected axial slices derived from the comparisons of each stimulus condition with the initial resting baseline scan. (Left) These four slices are from the within-subject comparisons and indicate areas of significant activation for each group separately (control, yellow scale; IBS, pink scale). (Right) These three slices are from the between-groups comparisons and indicate areas of greater activation over baseline for one group vs. the other (control > IBS, yellow scale; IBS > control, pink scale). Each row present results from a specific stimulus condition. The activations are displayed as statistical parametric maps that show areas of rCBF increase with a t value coded according to the color bars shown. The Statistical Parametric Mapping (SPM) is superimposed on a standard average anatomical reference image from the Montreal Neurological Institute (the "MNI brain"). The number above each axial slice is the relative distance to the AC-PC line (joining the anterior and posterior commissures), situated at 0 mm. The anterior part of the brain corresponds to the top of the image, and the posterior part corresponds to the bottom. The left side of each image is the right side of the brain (radiological orientation). Ant = anticipation; Sig = sigmoid stimulation.