About the Authors

Michael Fritz

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Rana El Rawas

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Sabine Klement

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Kai Kummer

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Michael J. Mayr

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Vincent Eggart

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Ahmad Salti

Affiliation Institute for Neuroscience, Medical University Innsbruck, Innsbruck, Austria

Michael T. Bardo

Affiliation Center for Drug Abuse Research Translation, University of Kentucky, Lexington, Kentucky, United States of America

Alois Saria

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Gerald Zernig

gerald.zernig@i-med.ac.at

Affiliation Experimental Psychiatry Unit, Department of General Psychiatry and Social Psychiatry, Center for Psychiatry and Psychotherapy, Medical University Innsbruck, Innsbruck, Austria

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MF KK GZ. Performed the behavioral experiments: MF SK. Performed the post-behavior brain fixation and the cresyl violet staining: RE A. Salti. Analyzed the data: MF GZ. Contributed reagents/materials/analysis tools: GZ A. Saria. Wrote the manuscript: GZ MF. Critically reviewed the manuscript and suggested substantial improvements: KK MM VE. Provided instrumental information with respect to previous CPP findings by other groups and greatly improved the quality of the paper: MTB. Critically reviewed the contents of the paper and provided instrumental suggestions and infrastructure: A. Saria.