Fig. 5. Histologic localization of microdialysis probe sites in the basal forebrain and the somatosensory cortex in N -methyl-d-aspartate groups (dual-probe technique). Open triangles (awake group) and rhombuses (anesthesia group) represent the location of the tips of the microdialysis probe for N -methyl-d-aspartate perfusion into the basal forebrain. Closed circles (awake group) and open circles (anesthesia group) represent the location of the tips of the microdialysis probe for measurement of acetylcholine in the somatosensory cortex. Coronal sections were adopted from the atlas of Paxinos and Waston, 18 with permission from Elsevier. Number at the bottom right indicates distance from bregma along the anteroposterior axis.