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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Closed-loop two-photon functional imaging in a freely moving animal.

Paul McNulty1, Rui Wu1, Akihiro Yamaguchi1

  • 1Department of Physics, New York University, New York, NY, USA.

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|July 2, 2025
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Summary

We developed a new high-speed two-photon microscope to accurately measure neural activity in freely moving animals. This technology overcomes motion artifacts, enabling new discoveries in brain function and behavior.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Microscopy

Background:

  • Direct measurement of neural activity in freely moving animals is crucial for understanding brain function.
  • Brain motion, scattering, and autofluorescence complicate quantitative fluorescence measurements.
  • Existing two-photon microscopy requires brain anchoring, limiting applications in unrestrained subjects.

Purpose of the Study:

  • To develop a novel microscopy technique for real-time 3D motion correction in unrestrained, freely moving animals.
  • To enable quantitative functional imaging of neural activity despite significant brain motion.
  • To discover novel neural correlates of behavior in Drosophila larvae.

Main Methods:

  • Development of a closed-loop resonant axial-scanning high-speed two-photon (CRASH2p) microscope.
  • Implementation of a 'Pong' scanning strategy and a multi-stage registration pipeline for motion correction.
  • Volumetric ratiometrically corrected functional imaging in the central nervous system (CNS) of Drosophila larvae.

Main Results:

  • Successfully performed real-time 3D motion correction in unrestrained Drosophila larvae without reference markers.
  • Achieved quantitative, volumetric, ratiometrically corrected functional imaging of neural activity.
  • Discovered previously unknown neural activity patterns associated with larval behavior.

Conclusions:

  • The CRASH2p microscope effectively overcomes motion artifacts in in vivo neural imaging.
  • This technology provides a powerful tool for studying neural circuits controlling behavior in freely moving organisms.
  • The findings open new avenues for investigating brain function and neural representations of behavior.