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. Author manuscript; available in PMC: 2016 Mar 30.
Published in final edited form as: Brain Res. 2015 Jan 9;1602:119–126. doi: 10.1016/j.brainres.2015.01.004

Fig. 2.

Fig. 2

Mean (±SEM) percent changes in intracranial self-stimulation reward thresholds compared to baseline in HiS and LoS rats treated with either morphine+naloxone (MOR+NAL) or saline+naloxone (SAL+NAL) over 4 days. @ indicates that LoS MOR+NAL rats had a greater percent increase in reward threshold compared to LoS SAL+NAL. & indicates that HiS MOR+NAL had a greater percent increase in reward threshold compared to HiS SAL+NAL rats.