Large-scale two-photon calcium imaging in freely moving mice
Cell(2021)
摘要
We developed a miniaturized two-photon microscope (MINI2P) for fast, high-resolution, multiplane calcium imaging of over 1,000 neurons at a time in freely moving mice. With a microscope weight below 3g and a highly flexible connection cable, MINI2P allowed imaging to proceed with no impediment of behavior in half-hour free-foraging trials compared to untethered, unimplanted animals. The improved cell yield was achieved through a new optical system design featuring an enlarged field of view (FOV) and a new micro-tunable lens with increased z -scanning range and speed that allowed for fast and stable imaging of multiple, interleaved planes as well as 3D functional imaging. A novel technique for successive imaging across multiple, adjacent FOVs enabled recordings from more than 10,000 neurons in the same animal. Large-scale proof-of-principle data were obtained from cell populations in visual cortex, medial entorhinal cortex, and hippocampus, revealing spatial tuning of cells in all areas, including visual cortex.
Highlights We developed a lightweight 2-photon miniscope for imaging in freely-foraging mice
Activity can be monitored in volumes of over 1,000 visual or entorhinal-cortex cells
A new z -scanning module allows fast imaging across multiple interleaved planes
Successive imaging from adjacent regions enables imaging from more than 10,000 cells
### Competing Interest Statement
The authors have declared no competing interest.
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