Benchmarking miniaturized microscopy against two-photon calcium imaging using single-cell orientation tuning in mouse...

Area of Science:

• Neuroscience
• Optical Imaging
• Animal Models

Background:

• Miniaturized microscopes enable long-term, in vivo optical recordings from neurons in freely moving animals.
• Direct comparisons between miniaturized and established microscopy techniques (e.g., two-photon) are lacking for individual neuronal responses.

Purpose of the Study:

• To quantitatively compare neuronal responses and tuning properties obtained with miniaturized microscopes versus bench-top two-photon microscopes.
• To validate the utility of miniaturized microscopes for detailed neurophysiological studies.

Main Methods:

• Calcium imaging was performed in the primary visual cortex of mice using both miniaturized and two-photon microscopes.
• Animals were presented with drifting gratings stimuli to assess visual responses.
• Individual neurons were identified across both imaging modalities, and their orientation tuning was quantified.

Main Results:

• Calcium transient amplitude and signal-to-noise ratio showed high correlation between both microscopy methods.
• Neuropil contamination was observed to influence miniaturized microscopy data.
• Neuronal orientation tuning properties were strongly correlated between the two imaging techniques.

Conclusions:

• Miniaturized microscopes yield quantitatively similar neuronal tuning data compared to two-photon microscopes.
• Despite minor influences like neuropil contamination, miniaturized microscopes are reliable for detailed neural analysis.