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Top panel. Time (sec) spent by each group on the formerly naloxone- and saline-paired floors in the 30-min test session. Bottom panel. Test session data represented as change scores, defined as time spent on the formerly naloxone-paired floor minus time spent on the formerly saline-paired floor. Abbreviations: ext, extinction; nalox, naloxone; veh, vehicle. * p < 0.05, ** p < 0.01.
