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    Researchers developed novel 3D shell microelectrode arrays (MEAs) to study electrical activity in neural organoids (NOs). This technology enables precise neuromodulation and mapping of brain organoid function for biocomputing applications.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Tissue Engineering

    Background:

    • Neural organoids (NOs) are crucial for brain research and biocomputing.
    • Monitoring NO electrical activity is key for understanding brain function and biocomputing paradigms.
    • Existing 2D microelectrode arrays (MEAs) limit the study of 3D neuromodulation in NOs.

    Purpose of the Study:

    • To develop and demonstrate a novel 3D neuromodulation and recording technique for neural organoids.
    • To investigate the relationship between electrical stimulation and neural activity in 3D.
    • To enable spatiotemporal mapping of neuromodulatory effects on NOs.

    Main Methods:

    • Fabrication and application of 3D "shell MEAs" mimicking EEG caps for neural organoids.
    • Application of controlled electrical stimulation (20-30 µA) to NOs.
    • Recording and analysis of neural firing rates and generation of 3D spatiotemporal activity maps.

    Main Results:

    • A specific stimulation current range (20-30 µA) significantly increased neuron firing rates in NOs.
    • Neuromodulatory effects were observed using both 3- and 16-electrode shell MEAs.
    • Successful generation of 3D spatiotemporal maps detailing neuromodulatory activity on the NO surface.

    Conclusions:

    • The 3D shell MEA technology provides a novel method for investigating spatiotemporal neuromodulation in neural organoids.
    • This approach is relevant for advancing biomedical engineering and biocomputing research.
    • The study establishes a foundation for more sophisticated brain organoid functionality studies.