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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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The Physiology of Taste01:24

The Physiology of Taste

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Conditioned Taste Aversion01:14

Conditioned Taste Aversion

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Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
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Gustation01:43

Gustation

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Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
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Updated: Oct 5, 2025

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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Valence opponency in peripheral olfactory processing.

Shiuan-Tze Wu1, Jen-Yung Chen1,2, Vanessa Martin1

  • 1Neurobiology Section, Division of Biological Sciences, University of California San Diego, La Jolla, CA 92093.

Proceedings of the National Academy of Sciences of the United States of America
|January 29, 2022
PubMed
Summary
This summary is machine-generated.

Fruit flies organize olfactory neurons into opposing pairs, creating a sensory map. This map uses electrical signals to process competing smells for behaviors like egg laying and courtship.

Keywords:
countervailing cuesolfactory receptor neurons (ORNs)olfactory sensillasensory mapvalence opponency

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Olfaction Research

Background:

  • Complex sensory systems often use neural maps for processing parallel inputs via lateral inhibition.
  • The existence and organization of such maps in the sense of smell (olfaction) remain largely uncharacterized.

Purpose of the Study:

  • To investigate the organizing principle of paired olfactory receptor neurons (ORNs) in Drosophila sensory hairs.
  • To determine if a functional map exists in Drosophila olfaction and how it processes sensory information.

Main Methods:

  • Systematic behavioral assays were conducted to analyze the function of paired ORNs.
  • Odor-mixture experiments were performed to assess the role of ephaptic coupling.
  • Computational modeling was employed to understand the processing of odor information.

Main Results:

  • Paired ORNs in Drosophila exhibit valence opponency, antagonistically regulating the same behaviors.
  • Ephaptic coupling between paired ORNs provides peripheral processing of countervailing odor cues.
  • This organization is relevant in behaviors such as place preference, egg laying, and courtship.

Conclusions:

  • Drosophila olfaction utilizes a valence map organized by ephaptic coupling between paired ORNs.
  • This peripheral processing mechanism allows for efficient evaluation of odor mixtures.
  • The olfactory valence map may have evolved for rapid processing of complex odor blends without synaptic computation.