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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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Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Related Experiment Video

Updated: Jun 24, 2025

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation

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Bifurcation enhances temporal information encoding in the olfactory periphery.

Kiri Choi, Will Rosenbluth, Isabella R Graf

    Biorxiv : the Preprint Server for Biology
    |June 10, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Fruit flies use a unique neural firing dynamic to navigate turbulent odor plumes. This mechanism allows olfactory receptor neurons (ORNs) to efficiently detect crucial odor signal timing and intensity for survival.

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    Recording Temperature-induced Neuronal Activity through Monitoring Calcium Changes in the Olfactory Bulb of Xenopus laevis
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    Recording Temperature-induced Neuronal Activity through Monitoring Calcium Changes in the Olfactory Bulb of Xenopus laevis

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    Area of Science:

    • Neuroscience
    • Computational Biology
    • Animal Behavior

    Background:

    • Living organisms must adapt to environmental signals for survival.
    • Olfactory navigation in turbulent plumes presents challenges due to intermittent odor signals and wide-ranging concentration variations.
    • Drosophila melanogaster (fruit flies) rely on olfactory receptor neurons (ORNs) for odor detection and navigation.

    Purpose of the Study:

    • To investigate how Drosophila ORNs extract information from fluctuating odor signals for navigation.
    • To determine the theoretical mechanism underlying robust olfactory receptor neuron responses in turbulent environments.

    Main Methods:

    • Theoretical analysis of Drosophila ORN firing dynamics near a bifurcation point.
    • Development of a biophysical model incorporating calcium-based feedback.
    • Comparison of model predictions with experimental measurements of Drosophila ORN adaptation.

    Main Results:

    • Drosophila ORNs can exploit proximity to a firing dynamics bifurcation point to reliably extract odor fluctuation timing and intensity.
    • Near the bifurcation, the system exhibits invariance to signal variance, enabling efficient information transfer about odor fluctuations.
    • Mean adaptation alone maintains proximity to the bifurcation, negating the need for additional feedback or fine-tuning.

    Conclusions:

    • Proximity to a firing dynamics bifurcation point is a key mechanism for Drosophila ORNs to process olfactory information in turbulent environments.
    • The identified mechanism explains the observed adaptation characteristics of Drosophila ORNs without complex regulatory pathways.
    • This study provides insights into efficient sensory information processing in biological systems.