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Featured ArticleArticles, Behavioral/Systems/Cognitive

Chemosensory Convergence on Primary Olfactory Cortex

Joost X. Maier, Matt Wachowiak and Donald B. Katz
Journal of Neuroscience 28 November 2012, 32 (48) 17037-17047; DOI: https://doi.org/10.1523/JNEUROSCI.3540-12.2012
Joost X. Maier
1Volen National Center for Complex Systems, Department of Psychology, Program in Neuroscience, Brandeis University, Waltham, Massachusetts 02454, and
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Matt Wachowiak
2Department of Physiology, Brain Institute, University of Utah, Salt Lake City, Utah 84108
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Donald B. Katz
1Volen National Center for Complex Systems, Department of Psychology, Program in Neuroscience, Brandeis University, Waltham, Massachusetts 02454, and
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Abstract

Food perception and preference formation relies on the ability to combine information from both the taste and olfactory systems. Accordingly, psychophysical investigations in humans and behavioral work in animals has shown that the taste system plays an integral role in odor processing. However, the neural basis for the influence of taste (gustation) on odor (olfaction) remains essentially unknown. Here we tested the hypothesis that gustatory influence on olfactory processing occurs at the level of primary olfactory cortex. We recorded activity from single neurons in posterior olfactory (piriform) cortex (pPC) of awake rats while presenting basic taste solutions directly to the tongue. A significant portion of pPC neurons proved to respond selectively to taste stimuli. These taste responses were significantly reduced by blockade of the gustatory epithelium, were unaffected by blockade of the olfactory epithelium, and were independent of respiration behavior. In contrast, responses to olfactory stimuli, recorded from the same area, were reduced by nasal epithelial deciliation and phase-locked to the respiration cycle. These results identify pPC as a likely site for gustatory influences on olfactory processing, which play an important role in food perception and preference formation.

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The Journal of Neuroscience: 32 (48)
Journal of Neuroscience
Vol. 32, Issue 48
28 Nov 2012
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Chemosensory Convergence on Primary Olfactory Cortex
Joost X. Maier, Matt Wachowiak, Donald B. Katz
Journal of Neuroscience 28 November 2012, 32 (48) 17037-17047; DOI: 10.1523/JNEUROSCI.3540-12.2012

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Chemosensory Convergence on Primary Olfactory Cortex
Joost X. Maier, Matt Wachowiak, Donald B. Katz
Journal of Neuroscience 28 November 2012, 32 (48) 17037-17047; DOI: 10.1523/JNEUROSCI.3540-12.2012
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