Three-dimensional multi-site random access photostimulation (3D-MAP)

Area of Science:

• Neuroscience
• Biophotonics
• Optical Engineering

Background:

• Optogenetic control of neural ensembles is vital for brain research but current technologies face limitations in scale, speed, resolution, and cost.
• Multiphoton holographic optogenetics offers high resolution but is limited to small neuronal populations and requires high power.
• One-photon holographic methods stimulate more neurons with lower power but have restricted resolution or volume, and existing systems are prohibitively expensive.

Purpose of the Study:

• To introduce a novel one-photon light sculpting technique, 3D-MAP, to overcome the limitations of existing optogenetic tools.
• To enable high-throughput, all-optical interrogation of neural circuits with improved scale, speed, simplicity, and cost-effectiveness.

Main Methods:

• Developed and implemented three-dimensional multi-site random access photostimulation (3D-MAP), a one-photon light sculpting technique.
• Modulated light dynamically in spatial and angular domains at multi-kHz rates.
• Applied 3D-MAP for in vivo interrogation of neural circuits in the intact mouse brain, enabling simultaneous photostimulation and imaging.

Main Results:

• Demonstrated simultaneous photostimulation and imaging of dozens of user-selected neurons in the intact mouse brain in vivo.
• Achieved high spatio-temporal resolution in neural circuit interrogation using 3D-MAP.
• Validated 3D-MAP's capability for large-scale, fast optical control of neural activity.

Conclusions:

• 3D-MAP overcomes the limitations of existing optogenetic technologies, offering a scalable, fast, and cost-effective solution.
• The technique facilitates high-throughput all-optical interrogation of brain circuits, paving the way for broader adoption in neuroscience.
• 3D-MAP represents a significant advancement for studying brain function and disease through precise optical control of neural ensembles.