Fig. 2.

Both age groups showed activation in the aMCC and pACC during maximum thirst. The loci of aMCC activations during maximum thirst were at (12, 24, 26) in the young group (A and C) and (12, 18, 48) in the older group (E and G). The postdrink period was notable for an absence of activation in the aMCC in the younger (B and D) and older (F and H) groups. Activation of the pACC during the postdrink period was absent in the older group (F and H), but was apparent at (12, 42, 6) in the younger subjects (D).