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Related Experiment Video

Updated: Jul 28, 2025

Examining Local Network Processing using Multi-contact Laminar Electrode Recording

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Published on: September 8, 2011

Cortical layering disrupts multi-electrode current steering.

Sabrina J Meikle^1,2,3,4, Maureen A Hagan^1,2, Nicholas S C Price^1,2

¹Department of Physiology and Biomedicine Discovery Institute, Monash University, Clayton, Vic 3800, Australia.

Journal of Neural Engineering

|June 2, 2023

Summary

This summary is machine-generated.

Current steering between electrodes in the visual cortex did not precisely target specific layers for restoring sight. However, it effectively lowered stimulation thresholds, potentially reducing side effects in neural prostheses.

Keywords:

cortical stimulation current steering visual cortex visual prostheses

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Electrode Positioning and Montage in Transcranial Direct Current Stimulation

Electrode Positioning and Montage in Transcranial Direct Current Stimulation

Published on: May 23, 2011

Area of Science:

Neuroscience
Biomedical Engineering
Ophthalmology

Background:

Millions worldwide experience blindness, driving research into cortical visual prostheses.
These devices electrically stimulate the visual cortex to restore sight.
Targeting specific cortical layers, particularly layer 4, is crucial for evoking visual percepts but challenging due to anatomical variability.

Purpose of the Study:

Investigate the feasibility of current steering for layer-specific neural stimulation.
Determine if neural activity peaks can be manipulated between electrodes in different cortical layers.

Main Methods:

Implanted a 64-channel, 4-shank electrode array into the rat visual cortex.
Applied varying charge ratios (100:0, 75:25, 50:50) and separation distances (300-500μm) to two electrodes.
Recorded multiunit neural activity to assess stimulation effects.

Main Results:

Current steering did not consistently shift neural activity peaks between cortical layers.
Both single and dual-electrode stimulation activated neurons throughout the cortical column.
Dual-electrode stimulation reduced stimulation thresholds compared to single-electrode stimulation.

Conclusions:

Multi-electrode current steering is not suitable for precise layer-specific activation in visual prostheses.
However, it can lower activation thresholds, potentially mitigating side effects like seizures.