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. 2019 Oct 30;9:15687. doi: 10.1038/s41598-019-51497-y

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Experimental task. (A) Drawings of the 3 visuo-spatial contexts (drawings of the pictures used were made by Salomé Blain, the original pictures can be seen in Saive et al.^34,35). The odors were presented when clicking in the yellow circles added on the pictures. (B) Photo showing the experimental setup with the breathing apparatus (copyright holder: Partick Minary, INSERM). (C) The temporal course of the encoding and retrieval sessions. During the encoding, the participants discovered one episode per day (during 7 min) over 3 days. During the night at home, they woke up at 5 am and at their usual waking time to record their dreams with a voice recorder (Dream report). In the morning they fill in a questionnaire about dream content (Q. dream content). The last day, they underwent a retrieval session and filled in a final questionnaire (Final Q.). (D) In the retrieval session, the memory of the episodes was tested using an odor-recognition task followed for the ‘Yes’ trials by an episodic memory retrieval task. The perfume bottle and the clock were drawn by the authors. All rights reserved, this image is not included under the Creative Commons licence for the article.