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Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue

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Published on: October 26, 2014

Preferential superficial cortical layer activation during seizure propagation.

Anastasia Brodovskaya¹, Shinnosuke Shiono¹, Chengsan Sun¹

¹Department of Neurology, University of Virginia, Charlottesville, Virginia, USA.

|December 24, 2024

Summary

Long-distance focal cortical seizures spread through superficial brain layers. This study reveals that superficial cortical neurons, not deep ones, are key to rapid, long-range seizure propagation.

Keywords:

Layer 2/3 Layer 5/6 deep layers epilepsy excitatory synaptic connectivity local field potentials seizures superficial layers

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Area of Science:

Neuroscience
Epilepsy Research
Cortical Circuitry

Background:

Focal cortical seizures propagate over long distances, but the exact pathways remain unclear.
Previous studies using in vitro and in vivo imaging have primarily focused on local seizure spread, leaving long-distance propagation mechanisms uncertain.
Conflicting evidence exists regarding the role of cortical layers in seizure spread, with some studies suggesting deep layers and others superficial layers.

Purpose of the Study:

To investigate the long-distance propagation pathways of focal cortical seizures.
To determine the role of different cortical layers in the spread of seizures across the cortex.
To identify the neuronal circuits involved in long-distance seizure propagation.

Main Methods:

Utilized activity reporter mice to image seizure-activated neurons.
Employed microelectrode arrays to record local field potentials (LFPs) in awake mice.
Mapped cortical seizure propagation to analyze spread patterns and speeds.

Main Results:

Seizures originating in the frontal lobe activated superficial cortical layers (2-3) more extensively than deep layers (5-6) across the cortex.
LFP recordings indicated significantly faster seizure spread through superficial cortical layers compared to deep layers over distances up to 3.5 mm.
Identified monosynaptically connected long-distance neurons as integral components of the seizure circuit.

Conclusions:

Propose that long-distance cortical seizure spread preferentially utilizes synaptically connected superficial cortical neurons.
Suggest superficial cortical layers play a critical role in the rapid propagation of seizures across the brain.
Findings challenge previous assumptions and highlight superficial cortical circuitry as a potential target for epilepsy interventions.