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. 2017 Feb 1;11:23. doi: 10.3389/fnhum.2017.00023

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Copyright © 2017 Beyer, Batsikadze, Timmann and Gerwig.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experiment 3 using a cephalic reference. Mean percentage CR incidence and SE in acquisition trials (A), extinction (B) and savings on the next day (C), shown per block of 10 trials. Anodal (blue circles), sham (red circles) and cathodal tDCS (gray circles) was applied during extinction trials. CR incidences in block 1 of extinction trials are shown more detailed in blocks of two trials. Decline of CRs across the four extinction blocks was not significantly different comparing stimulation groups. See “Results” Section for further details.