Fig. 4.

Contrasting responsiveness of BL, central nucleus (Ce), and ITC cells to electrical stimuli delivered in the infralimbic (IL) cortex and brain stem (BS). Single-unit recordings of amygdala neurons were obtained with high-impedance micropipettes in urethane-anesthetized rats. A: scheme showing 29 electrode tracks with dots indicating the position of recorded cells. In all 29 cases, an amygdala neuron was juxtacellularly labeled with neurobiotin and its position used to infer the location of all recorded cells. In 3 of these tracks (arrow and open circles), the labeled cells were located in the LA. In the remaining tracks, we attempted to label cells near the Ce-BL border. The 19 cases where the recovered cells were within ≤0.2 mm of the Ce-BL border are depicted in Fig. 6B. B–D: proportion of responsive BL, Ce, and ITC cells to electrical stimuli delivered in IL (B and C) or BS (D and E). Antidromic responses are shown in B and D; orthodromic responses are shown in C and E. AST, amygdalostriatal transition; BLA, basolateral amygdala; STR, striatum.