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. 2014 Apr 29;8:138. doi: 10.3389/fnbeh.2014.00138

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Copyright © 2014 Mandairon, Kermen, Charpentier, Sacquet, Linster and Didier.

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) or licensor 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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Context-activated behavioral and neural responses depend on central inputs to the olfactory bulb. (A) Mice were trained similarly to previous groups (see Figure 1) and tested with no odor. The day of the test, animals were injected in the olfactory peduncle with lidocaine (“Lim-NO-Lido” group) or saline (“Lim-NO-Sal” group) 10 min before being placed in their training cage. (B) Lidocaine injection induced a decrease of investigation time compared to animals injected with saline. (C) The density of Zif268-positive cells was similar between both groups. (D) The overlap between Lim-Lim and Lim-NO significantly decreased when feedbacks to the OB were altered (^***p < 0.0001). (E) The spatial pattern of Zif268-positive cell density was altered when the animals were injected with lidocaine.