Skip to main content
. Author manuscript; available in PMC: 2020 Dec 30.
Published in final edited form as: Behav Brain Res. 2019 Sep 4;376:112211. doi: 10.1016/j.bbr.2019.112211

Figure 2.

Figure 2.

Mean responses on the active (filled symbols) and inactive (open symbols) levers as a function of session for rats self-administering α-PVP (top panel), 4MMC (bottom panel), or saline (both panels) on an FR1 schedule of reinforcement. * indicates a significant difference from saline for active lever presses, and $ indicates a significant difference between active and inactive lever presses within drug group (drug x lever interactions). # indicates a significant difference from session 1 for 4MMC (drug x session interaction). n=8/group.