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. 2019 Jul 30;13:786. doi: 10.3389/fnins.2019.00786

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Copyright © 2019 Zhang, Ji, Yin, Wang, Zhou, Ni and Liu.

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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The illustration of olfactory stimuli presenting. Each stimuli lasted for 6 s, followed by a 42-s of clean odorless air, a total of 15 stimulus. 0.10, 0.33, and 1.00% lavender oil were used in the first five, second five, and third five stimulus, respectively.