Comparison of contralateral vs. bilateral response in SII. Data displayed is a subset of the data displayed in Figure 1. Region of interest is indicated in figurines. X and Z axes are distance, indicated in mm (along either the anterior-posterior axis or medial-lateral axis). Y axis is absorbance. In Subject 1, note the increase in absorbance in the posterior region in the bilateral response, as compared to the contralateral response (P'>P). Also note the slight decrease in absorbance in the anterior region in the bilateral response relative to the contralateral response (A'<A). In Subject 2, note that in the modules identified in anterior SII (1 & 2), the absorbance value at loci 1 & 2 are greater than their counterparts in the bilateral response (1' and 2'). Module 3, on the other hand, is located in posterior SII (the region of maximal ipsilateral activation), and the absorbance values at 3' are much greater than the values at 3.