EnerCage: a smart experimental arena with scalable architecture for behavioral experiments.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Electrical Engineering

Background:

• Miniaturized implantable electronics and wireless power are crucial for advanced neuroscience research.
• Freely behaving animal studies require solutions that overcome limitations of bulky batteries and tethers.
• Existing systems face challenges in extended experimental duration and arena size.

Purpose of the Study:

• To present the first fully functional EnerCage system for wireless power delivery to freely behaving animals.
• To improve power transfer efficiency (PTE) and system scalability compared to previous designs.
• To demonstrate the system's capability for uninterrupted electrophysiology experiments in large, arbitrary experimental arenas.

Main Methods:

• Development of a new EnerCage system utilizing a reduced number of planar spiral coils (PSCs) and magnetic sensors through multicoil coupling.
• Implementation of an Ethernet backbone for a modular and scalable architecture.
• Testing the system with a freely behaving rat, delivering continuous power to an animal headstage.

Main Results:

• Achieved a power transfer efficiency (PTE) of 5.6% at a 120 mm coupling distance and 48.5 mm lateral misalignment.
• Successfully powered animal headstage electronics with 20 mW continuously for over one hour.
• Demonstrated system operation in a 3538 cm(2) experimental area, showcasing scalability and modularity.

Conclusions:

• The enhanced EnerCage system provides a robust solution for wireless power in neuroscience research with freely behaving animals.
• The system's improved efficiency, scalability, and modularity support extended, untethered electrophysiology experiments.
• This technology has the potential to significantly advance basic and preclinical neuroscience studies.