Fig. 3.

Activation was observed in the cingulate cortex in both groups. (A) The anterior midcingulate cortex (aMCC) (circled) was activated in both groups (Y: 10, 12, 32; O: 14, 26, 26). (B) The mean signal in the aMCC decreased after drinking. (C) The proportional change in aMCC signal change correlated with the amount of water drunk by subjects in both the young and older groups. The slope of the respective regression lines for the two groups indicates a greater level of signal change at lower levels of water drunk in the older group.