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Effects of EE and NoEE in combination with EXT (A) or NoEXT (B) on responding during weekly extinction training sessions and daily cocaine self-administration reacquisition sessions. Data are the mean (± SEM) expressed as percent of baseline responses and shown relative to the EXT + NoEE control. ^ p<0.05 compared to extinction session 1 (main effect of session); * p<0.05 compared to the EXT + NoEE control group.
