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Retronasal Odor Perception Requires Taste Cortex, but Orthonasal Does Not
Meredith L Blankenship1, Maria Grigorova2, Donald B Katz3
1Program in Neuroscience, Brandeis University, Waltham, MA, USA.
Current Biology : CB
|December 25, 2018
Summary
Retronasal olfaction, from inside the mouth, rapidly influences flavor preference and shares brain pathways with taste. Orthonasal olfaction, from external smells, does not.
Area of Science:
- Neuroscience
- Sensory Science
- Olfactory Processing
Background:
- Olfaction involves two pathways: orthonasal (external) and retronasal (internal, from mouth).
- These pathways create distinct sensory experiences with different behavioral outcomes.
- Understanding their neural processing differences is crucial for sensory science.
Purpose of the Study:
- To investigate the distinct neural circuits processing orthonasal and retronasal olfaction.
- To determine if retronasal olfaction shares neural pathways with gustation (taste).
Main Methods:
- Utilized optogenetic manipulation in a flavor preference learning paradigm.
- Compared behavioral responses to orthonasal versus retronasal odor stimulation.
- Assessed the impact of insular gustatory cortex inactivation on olfactory preference expression.
Main Results:
- Retronasal odors induced rapid preference learning, unlike orthonasal odors.
- Retronasal odors potentiated preference learning for orthonasal stimuli.
- Inactivating the insular gustatory cortex selectively impaired retronasal preference expression.
Conclusions:
- Retronasal olfactory input is processed through neural circuits associated with taste.
- Orthonasal olfactory input does not share these taste-processing brain regions.
- This highlights distinct neural processing for internal versus external olfactory information.
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