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. 2014 Sep;21(9):488–497. doi: 10.1101/lm.034603.114

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© 2014 Fernando et al.; Published by Cold Spring Harbor Laboratory Press

This article, published in Learning & Memory, is available under a Creative Commons License (Attribution 4.0 International), as described at http://creativecommons.org/licenses/by/4.0/.

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Figure 1. — Rats preferentially responded to produce the safety signal in a two-lever choice test. (Top) Mean of the square-root transformed avoidance responses per minute on two levers with identical avoidance schedules; one of the levers produced the safety signal. Days 1–3 (Phase 1) the signal was presented contingent on responding on Lever 1, Days 4–6 (Phase 2) the signal was presented contingent on responding on Lever 2, Days 7–9 (Phase 3) the signal was presented contingent on responding on Lever 1. Each bar represents the mean of the SQRT transformed rate of avoidance responses per minute ± SEM. (Bottom) Mean untransformed avoidance responses per minute ± SEM.