A simultaneous optical and electrical in-vitro neuronal recording system to evaluate microelectrode performance.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Accurate neural recording is crucial for understanding brain function.
• Evaluating microelectrode performance requires robust and sensitive techniques.
• Existing methods may lack the necessary spatiotemporal resolution for detailed analysis.

Purpose of the Study:

• To detail the setup of a high spatiotemporal resolution system for simultaneous electrical and optical neural recording.
• To evaluate the performance of microelectrode arrays using a novel 'performance factor' metric.
• To compare the performance of gold and PEDOT/PSS coated electrodes.

Main Methods:

• Coupled low-noise electrical recording techniques with voltage-sensitive dyes for optical imaging.
• Utilized a customized amplification system and a high-speed CMOS camera.
• Characterized electrode performance using signal-to-noise ratio (SNR) and the proposed performance factor.

Main Results:

• Simultaneous electrical and optical recording of neuronal activity was successfully achieved and validated.
• Poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT/PSS) electrodes outperformed gold electrodes.
• The performance factor indicated a 3-fold improvement for PEDOT/PSS over gold, while SNR showed an 8-fold improvement.

Conclusions:

• A functional system for simultaneous electrical and optical neural recording was successfully developed.
• The system enables robust evaluation of extracellular microelectrode performance.
• This technology offers potential for improved detection of neural events and algorithm validation.