Microdrive were constructed and implanted as previously described (Likhtik et al., 2014). Briefly, craniotomies were made using AP and ML coordinates from bregma and DV coordinates from brain surface (provided in mm). Tungsten stereotrodes were implanted in the BLA (-2.06 AP, 3.15 ML, -3.4 DV) and tungsten wires were implanted in the mPFC (+1.65 AP, .3 ML, -1.6 DV), dorsal and ventral CA1 (-1.85 AP, 1.25 ML, -1.15 DV; -3.16 AP, 3.0 ML, -3.7 DV) under ketamine/xylazine anesthesia, supplemented with isoflurane. Skull screws over the cerebellum and frontal pole served as ground and reference, respectively.
