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. 2018 May 3;12:84. doi: 10.3389/fnbeh.2018.00084

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Copyright © 2018 Reinagel.

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 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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Effect of ad lib CA water on motivation to work for water rewards in a live-in testing protocol. Data from N = 13 experiments on N = 7 rats. The ad lib water contained either 2% CA (circles, N = 7) or 4% CA (triangles, N = 6). (A) Average trial rate with 24 h/day task access, when the only source of water was task rewards (Restr) vs. when ad lib CA water was also present 24 h/day (+CA). Bars indicate population averages; lines indicate the N = 13 paired comparisons. (B) Total rewards earned per day in the water-restricted condition vs. ad lib CA condition. (C) Total fluid intake (sum of earned rewards and ad lib CA water consumption).