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. Author manuscript; available in PMC: 2020 Dec 30.
Published in final edited form as: Behav Brain Res. 2019 Sep 11;376:112228. doi: 10.1016/j.bbr.2019.112228

Figure 2.

Figure 2.

Mean (±SEM) omissions following administration of amphetamine (a) and MK-801 (b). #p < .05, relative to rats trained on the long delay sequence. @p < .05, relative to rats trained on a FR 1 schedule of reinforcement. *p < .05, relative to vehicle.