A Wireless Optogenetic Headstage with Multichannel Electrophysiological Recording Capability

Area of Science:

• Neuroscience
• Biomedical Engineering
• Optogenetics

Background:

• Optogenetic tools are crucial for understanding neural circuits.
• Existing systems can be bulky, expensive, or lack wireless capabilities.
• There is a need for integrated, lightweight devices for small animal research.

Purpose of the Study:

• To develop a small, lightweight, fully wireless optogenetic headstage.
• To enable simultaneous optical neural stimulation and electrophysiological recording in small rodents.
• To utilize low-cost, commercial off-the-shelf components for flexibility and affordability.

Main Methods:

• Designed a foldable rigid-flex printed circuit board for a compact headstage.
• Integrated two fiber-coupled light-emitting diodes (LEDs) for optical stimulation.
• Incorporated two electrophysiological recording channels.
• Utilized a lithium-ion battery for wireless power.
• Tested the headstage in anesthetized transgenic ChR2 mice, recording from the cerebral cortex.

Main Results:

• The headstage demonstrated successful optical stimulation of light-sensitive neurons.
• Electrophysiological recordings captured microvolt amplitude signals.
• The device proved effective in triggering neuronal activity.
• The system achieved an optical power density of 70 mW/mm² at the fiber tip.

Conclusions:

• The developed wireless optogenetic headstage is a viable tool for neuroscience research.
• Its compact, lightweight, and low-cost design enhances experimental flexibility.
• The system effectively integrates optical stimulation and electrophysiological recording in small animals.