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Related Concept Videos

Olfaction01:25

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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.
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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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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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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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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.
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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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Testing for Odor Discrimination and Habituation in Mice
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Odor mixture perception during flavor consumption in rats.

Brooke A Christensen1, Cody S Triplett1, Joost X Maier1

  • 1Department of Neurobiology and Anatomy.

Behavioral Neuroscience
|March 7, 2022
PubMed
Summary

Rats perceive odor mixtures differently during flavor consumption, using elemental processing similar to components. This contrasts with other contexts, suggesting unique sensory mechanisms during eating.

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Area of Science:

  • Neuroscience
  • Olfactory Perception
  • Sensory Processing

Background:

  • Odor mixtures can be perceived as configural (holistic) or elemental (component-based).
  • Perceptual mode depends on peripheral and central neural interactions.
  • Flavor consumption involves distinct odor processing, but its effect on mixture perception is unknown.

Purpose of the Study:

  • To investigate how flavor consumption context influences odor mixture perception in rats.
  • To determine if rats use configural or elemental processing for odor mixtures during consumption.

Main Methods:

  • Rats were trained on a flavor consumption task.
  • Preferences for binary odor mixtures and their individual components were measured.

Main Results:

  • Rats demonstrated elemental processing of odor mixtures in the context of consumption.
  • This finding contrasts with previous studies using identical mixtures in non-consumption contexts.

Conclusions:

  • Flavor consumption alters odor mixture perception, favoring elemental processing.
  • Potential peripheral and central mechanisms underlying this context-specific perception are discussed.