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Related Experiment Videos

Neurons in human epileptic cortex: correlation between unit and EEG activity

A R Wyler, G A Ojemann, A A Ward

    Annals of Neurology
    |March 1, 1982
    PubMed
    Summary
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    In human epilepsy, single-unit firing rarely aligns with surface spikes between seizures. Synchrony between neuron and surface events requires high neuronal synchrony within the epileptogenic focus.

    Area of Science:

    • Neuroscience
    • Epilepsy Research
    • Clinical Electrophysiology

    Background:

    • Understanding the relationship between neuronal activity and epileptiform discharges is crucial for epilepsy research.
    • Previous studies in animal models suggest a link between single-unit firing and surface electroencephalography (EEG) spikes.

    Purpose of the Study:

    • To investigate the relationship between single-unit neuronal activity and electrocorticography (ECoG) spikes in human epilepsy patients.
    • To determine if synchronous neuronal firing correlates with epileptiform discharges during interictal periods.

    Main Methods:

    • Extracellular recordings of 90 neurons from 17 awake epilepsy patients during craniotomy.
    • Simultaneous recording of single-unit activity, local field potentials, and surface ECoG.

    Related Experiment Videos

  • Analysis of relationships between unit firing and epileptiform spikes.

    • Main Results:

    • Variable relationships were observed between single-unit firing and ECoG spikes.
    • Many neurons showed stronger phase-locking to local field potentials than to surface ECoG spikes.
    • Synchronous firing between simultaneously recorded units was rare, except at seizure onset.
    • High synchrony between unit and surface events was noted only in patients with frequent seizures.

    Conclusions:

    • Interictal surface epileptiform events in human epilepsy are not consistently linked to single-unit burst firing.
    • Synchrony between neuronal and surface events appears to necessitate high neuronal synchrony within the epileptogenic focus.
    • Findings contrast with some animal models, highlighting species-specific differences in epilepsy pathophysiology.