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In the mouse olfactory bulb (OB), prenatal and early postnatal odorant exposure through odorized food (food\/odorant pairing) not only increases the volume of activated glomeruli but also increases the number of mitral and tufted cells (M\/TCs) connected to activated glomeruli. Given the importance of M\/TCs in OB output and in mediating lateral inhibitory networks, increasing the number of M\/TCs connected to a single glomerulus may significantly change odorant representation by increasing the total output of that glomerulus and\/or by increasing the strength of lateral inhibition mediated by cells connected to the affected glomerulus. Here, we seek to understand the functional impact of this long-term odorant exposure paradigm on the population activity of mitral cells (MCs). We use viral expression of GCaMP6s to examine odor-evoked responses of MCs following prenatal and early postnatal odorant exposure to two dissimilar odorants, methyl salicylate (MS) and hexanal, which are both strong activators of glomeruli on the dorsal OB surface. Previous work suggests that odor familiarity may decrease odor-evoked MC response in rodents. However, we find that early food-based odorant exposure significantly changes MC responses in an unexpected way, resulting in broad increases in the amplitude, number, and reliability of excitatory MC responses across the dorsal OB.<\/jats:p>","DOI":"10.1523\/eneuro.0129-17.2017","type":"journal-article","created":{"date-parts":[[2017,9,26]],"date-time":"2017-09-26T00:55:35Z","timestamp":1506387335000},"page":"ENEURO.0129-17.2017","source":"Crossref","is-referenced-by-count":23,"title":["Prenatal and Early Postnatal Odorant Exposure Heightens Odor-Evoked Mitral Cell Responses in the Mouse Olfactory Bulb"],"prefix":"10.1523","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0729-4390","authenticated-orcid":false,"given":"Annie","family":"Liu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nathaniel 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