Fast volumetric calcium imaging across multiple cortical layers using sculpted light

Area of Science:

• Systems Neuroscience
• Neuroimaging

Background:

• High-speed, high-resolution calcium imaging in awake mammals is crucial for understanding neuronal circuit dynamics.
• Previous methods faced limitations in capturing functional dynamics of large-scale neuronal circuits.

Purpose of the Study:

• To present a novel light sculpting method for advanced in vivo calcium imaging.
• To enable high-speed and high-resolution imaging of neuronal activity in awake behaving mice.

Main Methods:

• Utilized light sculpting to achieve unbiased single- and dual-plane high-speed calcium imaging (up to 160 Hz).
• Developed in vivo volumetric calcium imaging of mouse cortical columns (0.5 mm × 0.5 mm × 0.5 mm) at single-cell resolution and 3-6 Hz volume rates.
• Optimized microscope point-spread function and employed a synchronized fiber laser amplifier to maximize signal-to-noise ratio.

Main Results:

• Successfully recorded calcium dynamics of several thousand neurons across cortical layers and in the hippocampus.
• Demonstrated high-speed (up to 160 Hz) and volumetric (3-6 Hz) imaging capabilities.
• Achieved single-cell resolution in vivo for neuronal circuit analysis.

Conclusions:

• The developed light sculpting method overcomes previous limitations in neural circuit imaging.
• This technique provides a powerful new tool for systems neuroscience research in awake behaving mammals.
• Enables unprecedented insights into the functional dynamics of large-scale neuronal circuits.