Spatiotemporal network dynamics and structural correlates in the human cerebral cortex in vitro

Area of Science:

• Neuroscience
• Human Brain Function
• Epilepsy Research

Background:

• Understanding human cerebral cortex function is crucial for both healthy and pathological brain states.
• Human cortical dynamics at the micro- and mesoscale remain incompletely understood.

Purpose of the Study:

• To characterize the spatiotemporal dynamics of human neocortical tissue.
• To investigate the impact of excitation/inhibition balance modulation on cortical activity.

Main Methods:

• Extracellular local field potential recordings from human neocortical slices obtained from epilepsy patients.
• Multi-electrode recordings combined with histological data for 2D spatiotemporal characterization.
• In vitro modulation of the excitation/inhibition balance using GABA(A) blockade.

Main Results:

• Human cortical slices exhibited spontaneous rhythmic activity with distinct Up and Down states.
• Up states propagated rapidly from deep to superficial cortical layers (vertical: 64.6 mm/s; horizontal: 65.9 mm/s).
• GABA(A) blockade induced epileptiform discharges characterized by increased firing rates, faster network recruitment, and infraslow rhythmicity.

Conclusions:

• The study provides a dynamical characterization of human cortical network organization.
• Findings enhance understanding of the mechanistic basis of healthy and pathological brain activity.
• Modulation of excitation/inhibition balance is a key factor in transitioning to epileptiform activity.