A wirelessly-powered homecage with animal behavior analysis and closed-loop power control

Area of Science:

• Neuroscience
• Biomedical Engineering
• Animal Behavior Research

Background:

• Longitudinal electrophysiology studies require systems that minimize invasiveness and allow natural animal behavior.
• Existing systems often face limitations in wireless power, data transmission, and simultaneous behavioral analysis.

Purpose of the Study:

• To present the EnerCage-homecage system (EnerCage-HC2) for advanced electrophysiology data acquisition in freely moving small animals.
• To integrate wireless power transmission, Bluetooth Low Energy communication, and sophisticated behavior tracking.

Main Methods:

• The EnerCage-HC2 utilizes multi-coil wireless power transmission (WPT) with closed-loop power control.
• Bidirectional data communication is achieved via Bluetooth Low Energy (BLE).
• Animal behavior is tracked and analyzed in real-time using Microsoft Kinect® technology, classifying 5 distinct behaviors.

Main Results:

• The system demonstrates an average power transfer efficiency (PTE) of 14%, delivering ~42 mW to the load at a 7 cm height.
• The Microsoft Kinect® system successfully tracked animal position and classified behaviors like standstill, walking, grooming, rearing, and rotating.
• A proof-of-concept experiment in rats validated the system's ability to operate a stimulator and generate an ethogram.

Conclusions:

• The EnerCage-HC2 system provides a robust platform for longitudinal electrophysiology and behavioral studies in freely moving rodents.
• This integrated system enhances experimental capabilities by offering wireless power, seamless data transfer, and detailed behavioral analysis.
• The technology facilitates more naturalistic research environments, improving the quality and scope of data acquisition in neuroscience.