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Related Concept Videos

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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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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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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Introduction to Special Senses01:26

Introduction to Special Senses

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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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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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New Methods to Study Gustatory Coding
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Encoding of mixtures in a simple olfactory system.

Kai Shen1, Sina Tootoonian, Gilles Laurent

  • 1California Institute of Technology, Division of Biology, CNS Program, Pasadena, CA 91125, USA.

Neuron
|November 12, 2013
PubMed
Summary

Insects perceive complex natural odors as single scents. Locust neural circuits in the mushroom body (MB) process these odors, enabling identification and generalization.

Area of Science:

  • Neuroscience
  • Olfactory processing
  • Insect behavior

Background:

  • Natural odors are complex mixtures, yet perceived as unitary percepts.
  • Olfaction supports stimulus categorization and generalization in humans and animals.

Purpose of the Study:

  • Investigate neural computations underlying olfactory perception of odor mixtures.
  • Analyze responses of projection neurons (PNs) and Kenyon cells (KCs) in locusts.

Main Methods:

  • Recorded responses of 168 PNs to two-odor mixtures.
  • Recorded responses of 174 PNs and 209 KCs to mixtures of up to eight odors.
  • Utilized linear classifiers to decode neural responses for odor identification and generalization tasks.

Main Results:

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Multi-unit Recording Methods to Characterize Neural Activity in the Locust Schistocerca Americana Olfactory Circuits
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Multi-unit Recording Methods to Characterize Neural Activity in the Locust Schistocerca Americana Olfactory Circuits
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  • PN responses exhibited hypoadditivity and clustered by concentration and mixture similarity.
  • KC responses were sparser than PNs and often indicated single odor components.
  • Linear classifiers successfully identified, categorized, and generalized odors from PN and KC population activity.

Conclusions:

  • Odor representations in the mushroom body balance memorization (sparseness) with identification, classification, and generalization.
  • Neural circuits effectively process complex olfactory mixtures for perception and behavior.