This study (Q42) is one of a series of studies performed in the Szechtman lab at McMaster University and deposited in the FRDR public repository as a collection under the name "A Digital Library of Behavioural Performance in Standardized Conditions - Szechtman Lab Collection". This collection as a whole constitutes a big dataset containing raw data objects of video, track, and path plot records of rats exploring for 55 minutes a large testing environment in a standardized paradigm during chronic treatment with psychostimulant drugs; for details of this big dataset see, https://www.frdr-dfdr.ca/repo/collection/szechtmanlab. The historical context for study Q42 was Project_12 entitled: "Resynthesis of compulsive checking". Title of experiment in Q42 was "Effect of NAc lesion plus mCPP (0.625 mg/kg on injections 1-4) in producing compulsive checking".