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Electrode placements for intracranial self-stimulation-1 (ICSS-1; black circles) and ICSS-2/noncontingent stimulation (NCS; gray circles) at A/P −3.60, −3.80, −4.52 and −5.6 (Paxinos & Watson, 2004). Electrode placement for three rats (ICSS-1) could not be determined due to histological error.
