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. 2021 Dec 16;15:780500. doi: 10.3389/fnbeh.2021.780500

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Copyright © 2021 Khom, Nguyen, Vandewater, Grant, Roberto and Taffe.

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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(A) Mean (±S.E.M.) infusions of Pentylone (N = 12), Methylone (N = 10), MDMA (N = 13), and saline (N = 8; Vehicle) obtained under extended access conditions. (B) Mean (±S.E.M.) percent of responses on the drug-associated lever. A significant difference from the first session, within group, is indicated with *, a significant difference from the first session, collapsed across groups, with%, a difference from the Vehicle and MDMA groups with &, a difference from the Vehicle group with §, and a difference from the MDMA group with #.