DLF lesions switch how bicuculline affects nociceptive sensitization. (A) The experimental design used to examine how DLF lesions affect GABA function. Subjects received either DLF lesion (DLF; black) or sham surgery (Sham; white). A day after surgery, rats received either bicuculline (Bic; squares) or vehicle (Veh; circles). Fifteen min later, capsaicin was applied to the dorsal surface of one hind paw. (B) The impact of DLF lesions and drug treatment on mechanical reactivity in capsaicin-treated rats. The y-axis depicts the linearized mechanical scores [log 10 (10,000g)] as a change from baseline after bicuculline treatment (Post Drug), and 0, 1, 2, 3 hr after capsaicin treatment (Post Cap). Error bars depict ± SEM.