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. 2020 Jun 3;14:70. doi: 10.3389/fnbeh.2020.00070

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Copyright © 2020 Wright, Gilmour and Dwyer.

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) and the copyright owner(s) 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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Mean lick cluster size (LCS: ±SEM) for the second solution available each day (4% vs. 32% sucrose) separated by strain (Wistar: Panels A,B; WKY: Panels C,D) and stress groups (No-Stress: Panels A,C; Stress: Panels B,D). Open symbols represent responses to the 4% sucrose solution, the filled symbols represent responses to the 32% sucrose solution made available in the second bottle. Data presented is averaged across 2-session blocks. While both WKY and Wistar rats showed significantly higher lick cluster size for 32% than 4% sucrose (reflecting its higher palatability), this difference was significantly smaller in WKY rats and mean lick cluster size overall was significantly lower in WKY rats, indicating a blunted hedonic response (see “Second Solution Lick Cluster Size—Low vs. High Sucrose Concentration” section for details).