Rats primed with morphine had a significant loss of DNIC following BLS in the left (A), right (B), and averaged (C) hindpaw measurements compared to vehicle-primed rats in both the vehicle and nor-BNI treatment groups. Administration of nor-BNI into the left CeA prior to BLS did not alter the loss of DNIC in the left (A), right (B), or averaged (C) hindpaw measurements. At the 20 minute DNIC timepoint (D) both morphine-primed groups have significantly less DNIC after BLS than saline-primed controls. *** p<0.001, ** p<0.01, * p<0.05 significant difference between the saline/vehicle group and other treatment groups. n= 10 saline/vehicle, 10 saline/nor-BNI, 6 morphine/vehicle, 6 morphine nor-BNI. Data analyzed by 3-way ANOVA with Sidak correction for multiple comparisons (A-C) or 2-way ANOVA followed by Tukey’s test for multiple comparisons (D).