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. 2017 Feb 21;11:77. doi: 10.3389/fnins.2017.00077

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Copyright © 2017 Fragale, Beck and Pang.

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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Relationship between relief (Q₀) and motivation (α) differ between strains. The relationship between Q₀ and α was assessed in Sprague Dawley (SD) and Wistar Kyoto (WKY) rats for negative and positive reinforcement. (A) In SD rats (n = 8), relief was positively correlated with motivation, such that rats showing greatest relief from shock cessation also demonstrated the most motivation to escape. (B) In contrast to SD rats, WKY rats (n = 6) showed no correlation between relief and motivation for negative reinforcement. (C) Similar to negative reinforcement, a positive correlation was observed in SD rats (n = 11) between pleasurability from sucrose and motivation to obtain sucrose. (D) Hedonic value and motivation for sucrose was not observed in WKY rats (n = 11).