{"id":3553,"date":"2026-04-15T09:29:20","date_gmt":"2026-04-15T07:29:20","guid":{"rendered":"https:\/\/5senses4kids.org\/en\/?p=3553"},"modified":"2026-05-11T17:39:36","modified_gmt":"2026-05-11T15:39:36","slug":"project-olfactory-memories-of-childhood","status":"publish","type":"post","link":"https:\/\/5senses4kids.org\/en\/project-olfactory-memories-of-childhood\/","title":{"rendered":"Project: &#8220;Olfactory Memories of Childhood&#8221;"},"content":{"rendered":"\n<h1 class=\"wp-block-heading has-text-align-center container has-text-color\" style=\"color:#3c7a95;font-size:50px\"><strong><strong>Scented memories of childhood <\/strong><\/strong><\/h1>\n\n\n\n<div style=\"height:150px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading container has-text-color has-link-color has-medium-font-size wp-elements-e3d821d2b89b3fd295faf7266dd8298d\" style=\"color:#3c7a95\"><strong><strong>2nd prize in the 2025 scientific research competition organised by the &#8220;5 Senses for Kids Foundation&#8221; in partnership with the Society for Neuroscience<\/strong><\/strong><\/h2>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n                    <iframe loading=\"lazy\" \r\n                        width=\"100%\" \r\n                        height=\"800\" \r\n                        id=\"\" \r\n                        class=\"dgwww_video_youtube \" \r\n                        src=\"https:\/\/www.youtube.com\/embed\/OTg2RvSRnEg?autoplay=1&mute=1&loop=1&color=white&playlist=OTg2RvSRnEg\" \r\n                        title=\"\" \r\n                        frameborder=\"0\" \r\n                        allow=\"accelerometer ; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share ;mute ;loop\" \r\n                        allowfullscreen=\"\"\r\n                    ><\/iframe>\n\n\n\n<p class=\"container has-small-font-size wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"container has-text-color has-link-color has-medium-font-size wp-elements-2b5baae3e6f3bac54a821f44adf7704b wp-block-paragraph\" style=\"color:#3c7a95\">This project was carried out by <strong>Jules DEJOU from <\/strong><strong>INSERM, the <\/strong> <strong>Lyon Neuroscience Research Centre (CRNL) \u2013 NEUROPOP team<\/strong>. <\/p>\n\n\n\n<p class=\"container has-text-color has-link-color has-medium-font-size wp-elements-9945b5b47080932e0ff6c822a52f68fe wp-block-paragraph\" style=\"color:#3c7a95\">The title of the project is &#8220;Olfactory memories of childhood: a study of their environmental, behavioral, and neuronal determinants through a translational approach in humans and mice&#8221;.<\/p>\n\n\n\n<div style=\"height:32px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"container wp-block-paragraph\"><img decoding=\"async\" src=\"https:\/\/5senses4kids.org\/wp-content\/uploads\/2026\/03\/image-1024x582.png\" alt=\"L\u2019image actuelle n\u2019a pas de texte alternatif. Le nom du fichier est : image.png\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-group container\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-26805bcdce889bcae0dfee4727977079\" style=\"color:#3c7a95\"><strong>Objectives<\/strong><\/h2>\n\n\n\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-color has-link-color has-medium-font-size wp-elements-ec992693bd21d9cf434d3b60dce86695 wp-block-paragraph\" style=\"color:#3c7a95\">It is often thought that no memories acquired before the age of three survive, but research shows this is not the case: these earliest memories do indeed exist, and are often older than we imagine. From the earliest years of life, autobiographical memory plays a central role in the construction of the self, as an entity situated in time and space. The five main senses (sight, hearing, touch, smell and taste) play a vital role in this function, as they are responsible for capturing sensory information, which is then transformed into lasting memories, thereby shaping each individual\u2019s personality. Research shows that, among these senses, smell stands out: memories evoked by smells are often older and associated with a more positive emotional valence than those triggered by other sensory modalities. Nevertheless, the conditions under which these memories are formed, as well as the underlying brain mechanisms, remain poorly understood. Against this backdrop, the aim of this thesis was to explore the encoding conditions and subjective experience, in adulthood, of childhood olfactory memories in humans, as well as their neural basis in mice.<\/p>\n\n\n\n<div style=\"height:28px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-cd42240062cd63da6c636f1a58b3e65c\" style=\"color:#3c7a95\"><strong>Project description<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-medium-font-size wp-elements-b3e385e0f0141de6082d742ff3a8eba7 wp-block-paragraph\" style=\"color:#3c7a95\">Initially, we conducted an online questionnaire survey of 647 participants to identify the parameters necessary for the formation of our earliest olfactory memory. The results indicate that these memories generally emerge from repeated associations between a pleasant smell and an environment that is both emotionally positive and multisensory. In adulthood, recalling these memories is accompanied by a strong positive emotional valence, a sense of nostalgia and the subjective impression of being transported back to the past.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-03809c3de90f529dc85049b4398caaf3\" style=\"color:#3c7a95\"><strong>Measurement method<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-medium-font-size wp-elements-8cace5bd14c9dafac98268abfc6fd518 wp-block-paragraph\" style=\"color:#3c7a95\">To examine the mechanisms underlying this phenomenon, we developed an experimental model in mice that replicates this early olfactory imprinting. The association of a pleasant odour with an enriched and positive environment during the juvenile period induces a lasting preference for that odour in adulthood. We then studied the neural basis of this memory. We highlighted the role of the olfactory bulb, the first brain structure involved in odour processing, which has the unique ability to generate new neurons after birth. In particular, certain neurons generated early in life appear essential for the persistence of this olfactory memory: inhibiting their activity alters the memory associated with the odour. Furthermore, the smell associated with childhood activates a brain network involving regions linked to reward and memory, contributing to the persistence as well as the strong positive emotional valence of these memories.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class=\"wpcp-wp-lightbox-host wpcp-advanced-image-lightbox-icon-hover\"><a class=\"wpcp-wp-lightbox-image-link\" href=\"https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image.jpg\" data-wpcp-wp-lb-image=\"1\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image-1024x576.jpg\" alt=\"\" class=\"wp-image-3569\" srcset=\"https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image-1024x576.jpg 1024w, https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image-300x169.jpg 300w, https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image-768x432.jpg 768w, https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image-1536x864.jpg 1536w, https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><a href=\"https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image.jpg\" data-fancybox=\"wpcp-wp-img-3569\" class=\"wpcp-lightbox-trigger wpcp-advanced-image-lightbox-icon wpcp-position-top-right wpcp-advanced-image-lightbox-icon-hover wpcp-global-lightbox-icon wpcp-lightbox-icon--global wpcp-lb-icon-style-default\" data-wpcp-lb-icon-source=\"global\" aria-label=\"Open image in lightbox\" data-thumb-src=\"https:\/\/5senses4kids.org\/en\/wp-content\/uploads\/sites\/2\/2026\/04\/image-300x169.jpg\" data-wpcp-lb-single=\"1\"><span class=\"wpcp-icon-container\"><svg viewBox=\"0 0 20 20\"><path d=\"M17.6585 16.025L14.2437 12.6198C15.1716 11.3338 15.6121 9.7613 15.4871 8.1819C15.362 6.60251 14.6795 5.11847 13.5607 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6.00503 12.8528 6.50859 13.086 7.06394C13.3192 7.6193 13.4393 8.21536 13.4393 8.81744C13.4393 9.41951 13.3192 10.0156 13.086 10.5709C12.8528 11.1263 12.5112 11.6298 12.081 12.0523C11.6573 12.4813 11.1523 12.822 10.5954 13.0545C10.0384 13.287 9.44066 13.4068 8.83687 13.4068C8.23308 13.4068 7.63532 13.287 7.07838 13.0545C6.52144 12.822 6.01644 12.4813 5.59278 12.0523Z\" \/><\/svg><\/span><\/a><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-123b4e92f156f00a27f9790bf5782405\" style=\"color:#3c7a95\"><strong>Impact<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-medium-font-size wp-elements-2c44c98f46ad14ddb6eb838ff60a6610 wp-block-paragraph\" style=\"color:#3c7a95\">These findings highlight how exposure to and attention paid to early sensory experiences \u2013 particularly olfactory ones \u2013 help shape our memory and identity through a positive emotional lens from the earliest years of life.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-medium-font-size wp-elements-c6abd119e007f5b7ac03e84ec688425d wp-block-paragraph\" style=\"color:#3c7a95\"><\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-medium-font-size wp-elements-c6abd119e007f5b7ac03e84ec688425d wp-block-paragraph\" style=\"color:#3c7a95\"><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A study of environmental, behavioral and neuronal determinants using a translational approach in humans and mice.<\/p>\n","protected":false},"author":9,"featured_media":3580,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[17],"tags":[],"class_list":["post-3553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-projects"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Project: &quot;Olfactory Memories of Childhood&quot;<\/title>\n<meta name=\"description\" content=\"Jules DEJOU from INSERM, the Lyon Neuroscience Research Centre (CRNL) \u2013 NEUROPOP team. 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