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. 2021 Apr 21;15:632548. doi: 10.3389/fnbeh.2021.632548

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Copyright © 2021 Muñiz-Diez, Muñiz-Moreno and Loy.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) 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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Conditioning phase in Experiment 1. PreX-X differences (±SEM), averaged for the two X− presentations per session in conditioning, are displayed. The black line represents the group that was trained with 14 A+, two AX−, 12 F−, and two X− presentations per session in conditioning. The gray line represents the group that was trained with 14 A+, two BX, 12 F−, and two X− presentations per session.