Fig. 3. Histologic localization of microdialysis probe sites in the posterior hypothalamus ( A ), the basal forebrain ( B ), and the primary somatosensory cortex, barrel field ( C ). Open triangles represent the location of the tip of the microdialysis probe for glutamate and γ-aminobutyric acid (GABA) measurements. Open rhombuses represent the location of the tip of the microdialysis probe for acetylcholine measurement. Coronal sections were adopted from the atlas of Paxinos and Waston, 18 with permission from Elsevier. Numbers at the bottom right indicate distance from bregma along the anteroposterior axis.