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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

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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

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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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Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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New Methods to Study Gustatory Coding
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Olfactory coding in the turbulent realm.

Vincent Jacob1,2, Christelle Monsempès1, Jean-Pierre Rospars1

  • 1Institute of Ecology and Environmental Sciences, INRA, route de St Cyr, Versailles, France.

Plos Computational Biology
|December 2, 2017
PubMed
Summary
This summary is machine-generated.

Moths can detect odor plume structure even far from the source. Projection neurons (PNs) encode odor onsets and offsets, crucial for tracking behavior.

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Multi-unit Recording Methods to Characterize Neural Activity in the Locust Schistocerca Americana Olfactory Circuits
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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Animal Behavior

Background:

  • Olfactory search relies on detecting odor dynamics, which are complex due to turbulence.
  • Odor signals form variable bursts with long odor/no-odor events, challenging olfactory systems, especially at greater distances from the source.
  • Understanding how animals encode olfactory information for long-distance tracking is crucial.

Purpose of the Study:

  • To investigate how moths encode the temporal dynamics of pheromone plumes at various distances from the source.
  • To analyze the information extracted by the olfactory system, specifically olfactory receptor neurons (ORNs) and antennal lobe projection neurons (PNs), under simulated turbulent conditions.
  • To determine the neural basis for decoding complex olfactory scenes during long-distance plume tracking.

Main Methods:

  • Comparison of ORN and PN responses to white-noise and realistic turbulent pheromone stimuli.
  • Utilizing linear-nonlinear models fitted with white-noise stimuli to predict responses to turbulent stimuli.
  • Analysis of neuronal firing rates and coding properties at simulated distances from 8 to 64 meters.

Main Results:

  • Neuronal firing rate correlation with odor dynamics decreases with increasing distance due to inefficient coding of prolonged odor/no-odor events.
  • Despite adaptation during long odor puffs, PNs successfully detect puff transitions.
  • Individual PNs, unlike ORNs, encode both the onset and offset of odor puffs across different temporal structures.

Conclusions:

  • PNs possess unique properties, including higher spontaneous firing rates and inhibitory phases, enabling them to decode temporal odor plume structures at any distance.
  • This temporal coding by PNs is essential for moths to effectively track odor plumes during long-distance navigation.
  • The study reveals a key neural mechanism underlying efficient olfactory navigation in complex environments.