A Low-Cost Multimodal Testbed for Array-Based Electrophysiological Microelectrodes

Area of Science:

• Neuroscience and Bioengineering
• Materials Science and Engineering

Background:

• Microelectrode arrays are crucial for cellular electrophysiology.
• Optimizing electrode design is challenging due to complex parameters and lack of predictive software.
• Current iterative development requires costly fabrication and empirical testing.

Purpose of the Study:

• To propose and implement a cost-effective testbed platform for early-stage screening of microelectrode prototypes.
• To provide a solution for obtaining first-order characteristics of new electrode designs.
• To reduce the barriers to entry for developing novel array-based microelectrodes.

Main Methods:

• Development of a novel, low-cost hardware testbed platform.
• Testing the platform with microfabricated electrodes.
• Validation of impedance measurement accuracy and extracellular action potential recording capabilities.

Main Results:

• The testbed achieved impedance measurement accuracy comparable to commercial equipment.
• The platform successfully recorded extracellular action potentials from in vitro rat cortical neurons.
• Demonstrated a significant reduction in cost, size, and assembly complexity compared to existing solutions.

Conclusions:

• The developed testbed effectively aids in the early-stage screening and refinement of microelectrode designs.
• This platform lowers entry barriers for innovation in array-based electrophysiological microelectrodes.
• Provides a valuable tool for researchers in cellular electrophysiology and neurotechnology development.