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. 2020 Jun 4;24(1):54–63. doi: 10.1093/ijnp/pyaa040

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© The Author(s) 2020. Published by Oxford University Press on behalf of CINP.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — Establishment and validation of a behavioral-economic (BE) procedure for palatable food. Active lever presses at each price during the within-session BE protocol were similar across sexes (a, LFP [low-fat palatable reward]; b, HFP [high-fat palatable reward], c, CSP [chocolate sucrose palatable reward]). However, body weights were significantly higher in males compared with females (d). An example demand curve from the within-session protocol (e) and strong demand curve fits (R² = 0.974 ± 0.023) across all animals supports feasibility of the BE procedure for palatable food. Estrus cycle was evaluated in female rats; Q₀ and α values did not differ between estrus and proestrus (f and g); all rats were either in estrus or proestrus (except for 1 rat in diestrus) at the time of testing. ****P < .0001.