METHODS: Wistar rats were divided to receive saline 1 ml kg or METH 1 mg kg, i.p. for 8 days during the conditioning training in the conditioned place preference CPP paradigm, which is one of the most popular models to study the motivational effects of drugs and non drug treatments in experimental animals. ...CONCLUSION: These results show the important role of social interactions and positive environment conditions in preventing reinstatement to drug use....