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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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Physiology of Smell and Olfactory Pathway01:20

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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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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Updated: Nov 15, 2025

New Methods to Study Gustatory Coding
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Encoding innately recognized odors via a generalized population code.

Qiang Qiu1, Yunming Wu1, Limei Ma1

  • 1Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA.

Current Biology : CB
|March 2, 2021
PubMed
Summary
This summary is machine-generated.

Mixing odors, even those with similar innate values, abolishes instinctive responses in mice. This occurs because crosstalk between olfactory bulb cells recodes odor information, impacting brain areas associated with odor preference.

Keywords:
configural perceptionelemental perceptionodor mixtureodor valenceolfactoryperceptual segmentationpopulation code

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Area of Science:

  • Neuroscience
  • Olfactory System
  • Sensory Processing

Background:

  • Innate valence (aversive or attractive) of odors triggers instinctive responses.
  • The neural encoding of innate odor valence remains largely unknown.
  • A prevailing model suggests insulated pathways for innate odor information.

Purpose of the Study:

  • To investigate how innate valence of odors is encoded in the olfactory pathway.
  • To determine the impact of odor mixtures on innate behavioral responses.
  • To elucidate the neural mechanisms underlying odor valence perception.

Main Methods:

  • Behavioral experiments in mice exposed to single odors and mixtures.
  • Electrophysiological recordings from the olfactory bulb (mitral and tufted cells).
  • Analysis of neural activity patterns and their correlation with behavior.

Main Results:

  • Mixing innately aversive or attractive odors abolished innate behavioral responses.
  • Odor components were not masked peripherally; glomeruli independently encoded mixture components.
  • Crosstalk among mitral and tufted cells altered activity patterns, preventing linear decoding of mixture components.
  • Reduced activation in brain areas linked to odor preference was observed.

Conclusions:

  • Crosstalk in the olfactory bulb recodes odor identity, abolishing innate valence.
  • Findings challenge the 'labeled line' model, supporting a common mechanism for innate and learned odor recognition.
  • Early processing stages in the olfactory pathway play a crucial role in shaping odor valence perception.