An integrated μLED optrode for optogenetic stimulation and electrical recording

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Optogenetics offers precise control over neural circuits using light.
• Simultaneous neural recording and stimulation are crucial for understanding neural pathways.
• Existing optrode technologies face limitations in integration and compactness.

Purpose of the Study:

• To develop an integrated neural probe prototype for optogenetic stimulation and simultaneous neural recording.
• To evaluate the efficacy of the developed optrode for cortical stimulation and recording in vivo.
• To highlight the advantages of the integrated optrode over existing fiber-coupled laser-based systems.

Main Methods:

• Development of a single-polyimide platform integrating microscale light-emitting diodes (μLEDs) and microelectrodes.
• Integration of a photo-polymerized lens for focusing μLED light.
• Testing the optrode probe on mice visual cortex neurons expressing channelrhodopsin-2 for stimulation and recording.

Main Results:

• The integrated optrode successfully achieved optogenetic stimulation and simultaneous recording of neural activity.
• Stimulation intensity and frequency-dependent spiking activities in the visual cortex were recorded.
• The device demonstrated advantages in closed-loop integration, compactness, and lower power consumption compared to laser-based systems.

Conclusions:

• The developed integrated neural probe represents a significant advancement for optogenetic research.
• The device's capabilities offer potential for future clinical applications, including prosthetic devices.
• This technology facilitates closed-loop neuromodulation and personalized medicine approaches.