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. 2014 Aug 18;8:283. doi: 10.3389/fnbeh.2014.00283

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Copyright © 2014 Myers, Smith, Servatius and Beck.

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) 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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Effects of punisher intensity. (A) The facilitated acquisition in WKY rats is independent of shock intensity (1 vs. 2 mA), although male WKY rats trained with the 2 mA shock extinguish more slowly than counterparts trained with 1 mA shock, or SD rats at either intensity. Adapted from Figure 1 of Jiao et al. (2011b). (B) In the model, shock intensity is determined by the value of R_press. As in the animal data, increasing the shock intensity (from R_press = -4 vs. -8) strongly attenuates extinction in the WKY model, with relatively little effect on extinction in the SD model.