High-speed whole-brain imaging in Drosophila

Area of Science:

• Neuroscience
• Microscopy
• Animal Behavior

Background:

• Brain-wide neural recordings in model organisms like *Drosophila* have revealed complex neuronal activity.
• Current volumetric imaging techniques face limitations in capturing fast neural dynamics due to slow imaging rates.
• Understanding rapid neural processes is crucial for deciphering brain function.

Purpose of the Study:

• To enhance the speed of volumetric imaging for brain-wide recordings in *Drosophila*.
• To investigate fast-timescale neural responses, including auditory and courtship song-related activity.
• To establish Light Beads Microscopy (LBM) as a tool for high-resolution fly brain imaging.

Main Methods:

• Development of a custom microscope and LBM module specifically for *Drosophila* brain experiments.
• Recording brain-wide calcium signals in adult, behaving flies using the LBM system.
• Achieving imaging speeds of 28 volumes per second (whole brain) and 60 volumes per second (central brain).

Main Results:

• Successfully captured fast-timescale auditory responses in the *Drosophila* brain that are missed by standard imaging.
• Demonstrated the ability to resolve responses to individual *Drosophila* courtship song pulses using LBM and temporal super-resolution.
• Achieved high spatial and temporal resolution for whole-brain activity mapping in flies.

Conclusions:

• Light Beads Microscopy (LBM) significantly improves volumetric imaging speed for *Drosophila* brain activity.
• LBM enables the study of rapid neural dynamics, such as responses to auditory stimuli and courtship songs.
• LBM is a powerful and viable tool for high-resolution, whole-brain imaging in neuroscience research.