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. 2022 May 24;16:854486. doi: 10.3389/fnbeh.2022.854486

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Copyright © 2022 Lee, Stephens and Kuhn.

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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Gradually increasing anxiety and acute fear reaction were untangled in standard behavioral tests as different psychological components with distinctive developments. Locomotion speed shows acute difference only in stressor zones [open arms (A) and light area (C)], but incubated differences in stressor-free zones [dark area (B) and closed arms (D)] (n_xScenIso = 8, n_ParObsIso = 8). *, 0.01 ≤ p < 0.05; ^**, 0.001 ≤ p < 0.01; ^***, p < 0.001.