Wireless opto-electro neural interface for experiments with small freely behaving animals.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Implantable Devices

Background:

• Electrocorticogram (ECoG) recording and optical stimulation are crucial for understanding neural activity.
• Existing methods often limit animal movement or require invasive procedures.
• There is a need for advanced tools for long-term, bi-directional neuromodulation in freely behaving subjects.

Purpose of the Study:

• To develop and validate a wireless opto-electro interface (WOENI) device.
• To enable simultaneous ECoG recording and optical stimulation in small, freely behaving animals.
• To facilitate bi-directional neuromodulation for advanced neuroscience research.

Main Methods:

• Developed a two-component WOENI device: a detachable headstage and an implantable substrate.
• Utilized Bluetooth Low Energy (BLE) for wireless data communication and control.
• Evaluated device functionality and stability in vivo on freely behaving rats over 21 days.

Main Results:

• Demonstrated successful bi-directional neuromodulation in rats through optical stimulation of the primary visual cortex (V1).
• Recorded spontaneous changes in ECoG signals from both left and right V1 in response to stimulation.
• Immunostained tissue analyses confirmed the efficacy of optical stimulation in upregulating cortical neuron activity (ChR2 expression).

Conclusions:

• The WOENI device offers a versatile solution for long-term optogenetic neuromodulation studies.
• The wireless and implantable nature of the device enhances experimental freedom.
• This technology has significant potential for advancing research in neural circuits and brain-computer interfaces.