A novel setup for simultaneous two-photon functional imaging and precise spectral and spatial visual stimulation in...

Area of Science:

• Neuroscience
• Vision Science
• Animal Behavior

Background:

• Drosophila melanogaster motion vision is well-studied, but color processing and its impact on other visual modalities remain less understood.
• Dissecting the early visual system's color processing components requires precise tools for evaluating spectral information integration.

Purpose of the Study:

• To develop a versatile visual stimulation setup for probing combined spatial, temporal, and spectral response properties in the fly visual system.
• To investigate color processing mechanisms in the medulla, the second visual neuropil of Drosophila.

Main Methods:

• Utilized flies expressing neural activity indicators to track visual responses in the medulla.
• Developed a setup for simultaneous two-photon imaging and visual stimulation using custom bandpass optical filters.
• Employed monochromator-produced light (390-730 nm) and specialized screen material for presenting spatially structured color stimuli.

Main Results:

• Successfully tracked visual responses in the medulla to projected color stimuli.
• Demonstrated layer-specific shifts in spectral response properties within the medulla.
• Correlated these spectral shifts with the projection regions of photoreceptor terminals.

Conclusions:

• The developed visual stimulation setup is effective for studying spectral responses in the fly visual system.
• Spectral response properties in the medulla exhibit layer-specific organization.
• These findings provide insights into the neural basis of color vision processing in Drosophila.