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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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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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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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Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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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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Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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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.
Sensory...
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Related Experiment Video

Updated: Dec 5, 2025

Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling

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Neuroscience: Illuminating Principles of Odor Coding.

Robin M Blazing1, Kevin M Franks1

  • 1Department of Neurobiology, Duke University Medical School, Durham, NC 27705, USA.

Current Biology : CB
|October 20, 2020
PubMed
Summary

Scientists used light to control nose cells, finding that the timing and type of cells activated determine how we perceive smells. This research sheds light on the complex mechanisms of odor perception.

Area of Science:

  • Neuroscience
  • Olfactory Science
  • Sensory Biology

Background:

  • The precise mechanisms underlying human odor perception remain incompletely understood.
  • Identifying the specific neural codes that differentiate similar odors is a significant challenge in olfactory research.

Purpose of the Study:

  • To investigate how the activation patterns of olfactory sensory neurons contribute to odor perception.
  • To explore the role of both the identity and temporal dynamics of neural activation in distinguishing smells.

Main Methods:

  • Utilized optogenetics to precisely control the activity of specific olfactory sensory neuron populations in vivo.
  • Developed novel methods to track and analyze the spatiotemporal patterns of neural activation in response to odorants.

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New Methods to Study Gustatory Coding
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Live-cell Measurement of Odorant Receptor Activation Using a Real-time cAMP Assay
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Live-cell Measurement of Odorant Receptor Activation Using a Real-time cAMP Assay

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Related Experiment Videos

Last Updated: Dec 5, 2025

Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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New Methods to Study Gustatory Coding
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Live-cell Measurement of Odorant Receptor Activation Using a Real-time cAMP Assay
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Live-cell Measurement of Odorant Receptor Activation Using a Real-time cAMP Assay

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Main Results:

  • Demonstrated that the specific ensemble of activated olfactory sensory neurons significantly impacts odor perception.
  • Revealed that the precise timing of neuronal activation, in addition to cell identity, plays a crucial role in discriminating between similar odors.
  • Showcased how manipulating activation timing can alter perceived smell identity.

Conclusions:

  • Odor perception is encoded not only by which olfactory sensory neurons are activated but also by the precise timing of their activation.
  • This study provides a new framework for understanding the neural basis of olfaction and opens avenues for future research into sensory coding.