Scalable Three-Dimensional Recording Electrodes for Probing Biological Tissues.

Area of Science:

• Neuroscience
• Bioengineering
• Materials Science

Background:

• Standard silicon probes have limitations in neural recording due to single-sided sites and stiffness.
• Understanding neural circuits requires advanced electrophysiological tools for comprehensive tissue sampling.

Purpose of the Study:

• To develop and evaluate high-performance, double-sided three-dimensional (3D) electrodes for enhanced neural recording.
• To assess the efficacy of these 3D electrodes in capturing neural activity in complex biological tissues.

Main Methods:

• Fabrication of ultraflexible, bioinspired open mesh structures with integrated double-sided 3D electrodes.
• In vivo electrophysiological recordings in the brain and retinal ganglion cells in mice.
• Comparison of 3D electrode performance against standard two-dimensional electrodes.

Main Results:

• Statistically significant increases in neuron count per electrode, average spike amplitudes, and signal-to-noise ratios were observed with 3D electrodes.
• Stable detection of single-neuron activity over extended periods (months) was achieved.
• Successful chronic recording from retinal ganglion cells demonstrated the versatility of the 3D electrode technology.

Conclusions:

• The developed double-sided 3D electrodes provide superior neural recording capabilities compared to conventional methods.
• This technology enables comprehensive 3D interrogation and understanding of neural circuitry in live animals over long durations.
• The ultraflexible, bioinspired design offers a promising platform for future neuroscientific research and clinical applications.