This study (Q23) 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 Q23 was Project_02 entitled: "Probing the neurochemistry of sensitization and compulsive checking". Title of experiment in Q23 was "Effect of co-treatment with kappa agonist U69593 and QNP on the development of sensitization and compulsive checking".