Electromagnetic Interference-Shielded Graphene-Copper Neural Interface for Real-Time Electrophysiology under Magnetic...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Magnetic neuromodulation offers wireless deep-brain stimulation but faces challenges with electromagnetic interference (EMI) affecting neural recordings.
• Conventional metal electrodes are susceptible to EMI, hindering accurate electrophysiological monitoring during stimulation.
• Real-time investigation of brain activity during magnetic neuromodulation is crucial for understanding neural dynamics.

Purpose of the Study:

• To develop an electromagnetic interference-shielded neural probe for high-fidelity in vivo electrophysiological recordings during magnetic neuromodulation.
• To enable simultaneous monitoring of neural activity in deep-brain regions during targeted magnetic stimulation.
• To investigate the neural circuit mechanisms underlying motivated behaviors using this novel recording platform.

Main Methods:

• Integration of graphene electrodes with copper shielding layers to minimize EMI.
• Development of a neural probe design to suppress broadband electromagnetic interference.
• Simultaneous electrophysiological recording from the lateral hypothalamus area (LHA) and ventral tegmental area (VTA) in freely moving mice.
• Application of neuron-specific magneto-mechanical stimulation of LHA GABAergic neurons.

Main Results:

• The EMI-shielded probe achieved stable, high-fidelity neural recordings under magnetic stimulation.
• Activation of the LHA-VTA circuit was observed during motivated feeding tasks.
• Key indicators of circuit activation included elevated firing rates, increased β-band oscillations, and enhanced inter-regional synchrony.
• Demonstrated the probe's capability for real-time monitoring of neural dynamics during deep-brain stimulation.

Conclusions:

• The developed EMI-shielded neural probe is a robust platform for real-time wireless magnetic deep-brain neuromodulation.
• This technology overcomes EMI limitations, enabling accurate neural recordings during stimulation.
• Opens new avenues for mechanistic studies and therapeutic development in neuroscience and neurology.