The Virtual Electrode Recording Tool for EXtracellular Potentials (VERTEX) Version 2.0: Modelling in vitro electrical...

Area of Science:

• Computational Neuroscience
• Neurophysiology

Background:

• Neuronal circuit modeling predicts stimulation effects on individual neurons.
• Extracellular potential recordings, like the local field potential (LFP), aggregate activity from many neurons.
• The Virtual Electrode Recording Tool for EXtracellular Potentials (VERTEX) previously simulated LFP from brain tissue patches.

Purpose of the Study:

• To extend VERTEX for simulating electrical stimulation via a focal electric field.
• To analyze direct neural activity changes and synaptic plasticity alterations.
• To investigate LFP current contributions, short-term plasticity (STP), and long-term potentiation (LTP) induction.

Main Methods:

• Utilized the enhanced VERTEX software for simulations.
• Applied paired pulse stimulation protocols to model STP.
• Employed theta burst stimulation (TBS) protocols to model LTP.
• Tested the model using a rat neocortical slice preparation.

Main Results:

• Simulated the impact of focal electrical stimulation on neuronal activity.
• Observed direct changes in neural activity and synaptic plasticity.
• Quantified currents contributing to the LFP.
• Modeled the induction of STP and LTP through specific stimulation patterns.

Conclusions:

• The enhanced VERTEX software accurately simulates the effects of electrical stimulation on neuronal circuits.
• The tool can differentiate between direct neural responses and plasticity-induced changes.
• VERTEX provides insights into LFP generation and plasticity mechanisms relevant to brain function and dysfunction.