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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. 1.

Fig. 1

Mean (±SEM) percent changes in intracranial self-stimulation reward thresholds compared to baseline in HiS and LoS rats 24- and 28-h following the last of 8 daily injections of morphine+saline (MOR) or saline+saline (SAL). @ indicates that LoS MOR rats had a greater percent increase in reward threshold compared to LoS rats treated with SAL. & indicates that HiS MOR rats had a greater percent increase in reward thresholds compared to HiS rats treated with SAL.