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Related Concept Videos

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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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Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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Related Experiment Video

Updated: Aug 29, 2025

Multi-unit Recording Methods to Characterize Neural Activity in the Locust Schistocerca Americana Olfactory Circuits
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Multilayer Network Framework Reveals Cross-Frequency Coupling Hubs in Cortical Olfactory Perception.

Mengting Jiang, Stavros Dimitriadis, Manuel S Seet

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |September 10, 2022
    PubMed
    Summary

    This study reveals how brain networks integrate olfactory information. Higher pleasantness activates more brain hubs, particularly in frontal and central regions, highlighting gamma band activity

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    Area of Science:

    • Neuroscience
    • Cognitive Science
    • Olfactory Perception Research

    Background:

    • Olfactory perception involves complex interactions across distributed brain networks.
    • Neural mechanisms for coordinating these networks and integrating information remain unclear.

    Purpose of the Study:

    • To model brain-wide cross-frequency coupling using electroencephalography (EEG) and network analysis.
    • To identify brain regions acting as hubs for information integration during olfactory perception.

    Main Methods:

    • Utilized electroencephalography (EEG) signals and multilayer network formalism.
    • Investigated alpha-gamma and theta-gamma cross-frequency coupling.
    • Analyzed brain activity during exposure to olfactory stimuli of varying pleasantness.

    Main Results:

    • A more distributed network of connecting hubs emerged under higher pleasantness conditions.
    • Significant differences in hub connectivity were observed in middle frontal and central brain regions.
    • Gamma band activity consistently plays a crucial role in olfactory information integration.

    Conclusions:

    • Brain network dynamics, particularly cross-frequency coupling, are key to olfactory perception.
    • Pleasantness modulates the emergence and connectivity of brain hubs.
    • Gamma band oscillations are vital for integrating sensory information in the olfactory system.