A new transparent multi-unit recording array system fabricated by in-house laboratory technology.

Area of Science:

• Neuroscience
• Electrophysiology
• Ophthalmology

Background:

• Recording multi-unit activity in the retina is crucial for understanding visual processing.
• Existing electrophysiological recording techniques can be limited in spatial resolution and stability.

Purpose of the Study:

• To develop and characterize a novel multi-electrode array system for high-resolution retinal recordings.
• To assess the feasibility of recording multi-unit activity from rabbit retina using the new array.

Main Methods:

• Fabrication of a transparent multi-electrode array using carbon fiber or tungsten microelectrodes with <100 micrometer spacing.
• Utilized standard electrophysiology laboratory equipment for array construction and associated electronics.
• Performed recordings in an isolated rabbit eyecup preparation, allowing for simultaneous visual stimulation and microscopic examination.

Main Results:

• Successfully recorded multi-unit activity from rabbit retinal ganglion cells using arrays with up to 32 elements.
• Achieved electrode success rates of approximately 50%, with some electrodes capturing signals from multiple cells.
• Maintained stable recordings for up to 6 hours, with arrays demonstrating durability over several months of repeated use.

Conclusions:

• The developed transparent multi-electrode array system is effective for stable, long-term multi-unit recordings in the rabbit retina.
• The system's design allows for manipulation similar to single electrodes and is compatible with standard laboratory techniques.
• This technology offers a promising tool for advancing research into retinal function and visual processing.