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Related Experiment Videos

[Elementary polysynaptic potentials of hippocampal neurons].

A V Bashkis, L L Voronin, A G Gusev

    Biulleten' Eksperimental'Noi Biologii I Meditsiny
    |December 1, 1980
    PubMed
    Summary

    This study investigated hippocampal neuron synaptic connections in rabbits. Results indicate that most hippocampal synapses exhibit low efficacy, suggesting limited signal transmission.

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    Ephaptic feedback in identified synapses in mollusk neurons.

    Neuroscience and behavioral physiology·2005
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    Stimulation of the lateral hypothalamus provokes the initiation of robust long-term potentiation of the thalamo-cortical input to the barrel field of the adult, freely moving rat.

    Neuroscience and behavioral physiology·2005
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    [Ephaptic feedback in identified synapses of terrestrial snails].

    Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova·2004
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    Postsynaptic depolarisation enhances transmitter release and causes the appearance of responses at "silent" synapses in rat hippocampus.

    Neuroscience·2004
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    Stimulation of the lateral hypothalamus provokes the initiation of robust long-term potentiation of the thalamo-cortical input to the barrel field of the adult, freely moving rat.

    Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova·2003
    Same author

    The potentiation of hippocampal responses at positive membrane potential reveals the presynaptic nature of the low efficacy of "silent" synapses.

    Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections·2003

    Area of Science:

    • Neuroscience
    • Synaptic Plasticity
    • Computational Neuroscience

    Background:

    • Understanding synaptic connections is crucial for comprehending neural circuit function.
    • The hippocampus plays a vital role in learning and memory, making its synaptic properties a key research area.

    Purpose of the Study:

    • To investigate the efficacy of synaptic connections between hippocampal neurons.
    • To quantify synaptic transmission properties using quantum analysis.

    Main Methods:

    • Intracellular recording of neuronal activity in nonanesthetized rabbits.
    • Spike-triggered averaging to detect synchronized activity and postsynaptic potentials (PSPs).
    • Quantum analysis of individual PSPs to determine mean quantum content and size.

    Main Results:

    • Synchronized activity, indicative of common inputs, was observed in 5 out of 26 neuron pairs.
    • Individual postsynaptic potentials (PSPs) with a 3-4 ms latency were identified in 3 pairs.
    • Quantum analysis revealed mean quantum content (0.27–0.65) and quantum size (35–200 µV) comparable to excitatory PSPs from intracerebral stimulation.

    Conclusions:

    • The findings suggest that most hippocampal synapses are characterized by low efficacy.
    • This low efficacy implies a limited contribution of individual synaptic events to overall neuronal activation.

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