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A Fine-Scale and Minimally Invasive Marking Method for Use with Conventional Tungsten Microelectrodes
Tatsuya Oikawa1, Kento Nomura1, Toshimitsu Hara1
1Department of Computer Engineering, Toyohashi University of Technology, Aichi 441-8580, Japan.
Eneuro
|September 11, 2023
Summary
A new tungsten-deposition method precisely marks electrode locations in the brain. This technique offers accurate, low-damage neural recordings and is viable for long-term in vivo studies.
Area of Science:
- Neuroscience
- Electrophysiology
- Histology
Background:
- Accurate correlation between neural activity and brain structures is vital in neurophysiology.
- Current electrode marking methods present limitations in precision and tissue damage.
Purpose of the Study:
- To introduce a novel tungsten-deposition technique for precise electrode marking.
- To evaluate the efficacy and longevity of this marking method.
Main Methods:
- Conventional tungsten electrodes were modified using biphasic current pulses to generate tungsten oxide.
- Markings were created with electrical currents of 40–50 μA, resulting in 10–100 μm deposits.
- The method was tested in mouse and macaque brains.
Main Results:
- The tungsten-deposition method produced small, easily detectable red markings under dark-field microscopy after Nissl staining.
- Markings exhibited minimal tissue damage and remained stable in vivo for over two years.
- The technique demonstrated feasibility across different species.
Conclusions:
- Tungsten-deposition is a highly accurate and durable electrode marking technique for neurophysiological research.
- This method enhances the precision of correlating neural responses with anatomic locations.
- The technique minimizes tissue damage, facilitating long-term in vivo experiments.
