Acknowledgements
The study was supported by grants from the Deutsche Forschungsgemeinschaft (German Research Foundation; SFB 874, project A1 to M.T.; SFB 1280 Extinction Learning project SFB1280 – project number 316803389, Project A13 awarded to A.Z. and J.M., project A09 to C.J.M. and O.T.W.; Heisenberg Grant ZL 59 4–1 and ZL 59 5–1 awarded to A.Z.). The funders had no role in study design, data collection and analysis, preparation of the manuscript and decision to publish.