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. 2016 Jan 22;9:369. doi: 10.3389/fnbeh.2015.00369

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Copyright © 2016 Lee, Haberman, Roquet and Monfils.

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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Freezing during fear conditioning with tone-shock pairings on Day 1 and tone presentations on Day 2. Rats in both groups showed fear acquisition and displayed comparable freezing levels on Day 1. On Day 2, rats in the 1 then 4 CSs group (n = 6) received a single tone presentation and then four additional tone presentations 15 min later to initiate the retrieval-extinction session, while rats in the 10 CSs group (n = 6) received 10 tone presentations to initiate the standard extinction session.