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. 2020 Nov;27(11):477–482. doi: 10.1101/lm.052316.120

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© 2020 Campese et al.; Published by Cold Spring Harbor Laboratory Press

This article is distributed exclusively by Cold Spring Harbor Laboratory Press for the first 12 months after the full-issue publication date (see http://learnmem.cshlp.org/site/misc/terms.xhtml). After 12 months, it is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.

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Figure 1. — (A) The experimental design used to compare shock and klaxon for their ability to elicit freezing or transfer. Percent time freezing to the tone for subjects trained with klaxon (Kx) and shock (Sk) are shown in B (n = 8 per group). Avoidance responses (ARs) during three-session blocks of Sidman avoidance training are shown in C for a different group of rats. Response per minute during the pre-CS (conditioned stimulus) and CS periods during the transfer testing phase are shown in D. Following elimination of poor avoiders in this group of 16 rats, six subjects remained in group Klaxon, while group Shock ultimately included five subjects. Asterisks represent statistical significance at the 5% level.