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A smart homecage system with 3D tracking for long-term behavioral experiments.

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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    The EnerCage-HC system wirelessly powers and tracks small animals during long-term electrophysiology experiments. This novel wirelessly-powered homecage enhances experimental efficiency and reduces system complexity.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Animal Behavior

    Background:

    • Long-term electrophysiology requires reliable power and behavioral tracking for freely moving subjects.
    • Existing systems often face limitations in mobility, power supply, and integrated behavioral monitoring.
    • Wireless power transfer and optical tracking offer potential solutions for untethered experimental setups.

    Purpose of the Study:

    • To present the EnerCage-HC, a wirelessly-powered homecage system for long-term electrophysiology.
    • To demonstrate the system's capability for simultaneous wireless power delivery and real-time behavioral tracking.
    • To evaluate the system's performance in an in vivo experiment with a freely behaving rat.

    Main Methods:

    • The EnerCage-HC utilizes multi-coil wireless power transfer (13.56 MHz) with optimized wire-wound coils (WWCs).
    • A Microsoft Kinect sensor provides optical tracking of animal position and orientation (1.6 cm accuracy).
    • A closed-loop power control system and graphic user interface (GUI) manage power delivery and data acquisition.

    Main Results:

    • The system achieved efficient wireless power transfer (>2x compared to 2-coil links) using a single power amplifier.
    • Real-time behavioral tracking was successfully demonstrated with high accuracy.
    • Continuous wireless power delivery (24 mW) was maintained for over 7 hours to a mobile unit in a freely behaving rat.

    Conclusions:

    • The EnerCage-HC system offers a robust and integrated solution for untethered, long-term electrophysiology studies.
    • Multi-coil wireless power transfer enhances efficiency and simplifies system design.
    • The system facilitates advanced behavioral neuroscience research by enabling naturalistic subject movement.