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Bar graphs of average extracted contrast values in independent data sets in area of PAG overlap identified in initial experiment (see conjunction analysis in Figure 2). (A) High > Low Pain contrasts from Studies 1–4. (B) Negative > Neutral Image Viewing contrasts from Studies 5–8. All contrasts were significant at P > 0.05, using one-tailed, independent-sample t-tests. Error bars represent between-subjects standard error. Additional information on the data sets is provided in Table 1.
