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2022-12-19T03:42:00Z
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9:10:11
Odorant Category Profile Selectivity of Olfactory Cortex
Yoshida, Ikue
3311
Mori, Kensaku
3312
493.7
olfactory cortex
food odor
odorant category
mixture facilitation
mixture inhibition
piriform cortex
The olfactory cortex receives converging axonal inputs from many mitral and tufted cells in the olfactory bulb. Recent studies indicate that single cortical neurons integrate signals from diverse odorants. However, there remains a basic question, namely, the signals from which kinds of odorants are integrated by the individual cortical neurons? The present study examined the possibility that some cortical neurons integrate signals from distinct component odorants of natural foods because individual foods produce a fixed combination of odorants. Previous psychophysical studies of core odorants emitted by fruits and vegetables suggest that the olfactory images of individual natural foods are basically characterized by the profile of structural and perceptual categories of food-born odorants. The single-unit spike responses of neurons in the dorsoposterior part of rat anterior piriform cortex to a panel of eight food-related categories of odorants were herein examined. The results showed that many cortical neurons in this region are tuned selectively to either a single category or a specific combination of distinct categories. The cortical neurons showed mixture facilitation and mixture inhibition when stimulated with mixtures of distinct categories, thus suggesting that olfactory circuits may play a role in enhancing the category-profile selectivity of individual neurons. These results indicate that signals from distinct categories of food-born odorants are integrated in these cortical neurons. This suggests that these cortical neurons detect the odorant-category profile of foods to distinguish distinct food odors.
journal article
Society for Neuroscience
2007-08-22
application/pdf
The Journal of neuroscience : the official journal of the Society for Neuroscience
34
27
9105
9114
AA10620404
02706474
https://repository.dl.itc.u-tokyo.ac.jp/record/858/files/JN_9105.pdf
eng
info:doi/10.1523/JNEUROSCI.2720-07.2007
http://dx.doi.org/10.1523/JNEUROSCI.2720-07.2007
Copyright 2007 The Society for Neuroscience