Dorsal ocelli set the luminance-dependent operating state of the bumblebee visual system
Despite long-standing hypotheses that insect dorsal ocelli modulate compound-eye processing to support flight stabilization, dim-light navigation, and locomotor speed, the neurophysiological basis of these functions remains unclear. Combining behavioural assays with multi-site local field potential recordings in bumblebees, we tested how ocellar input affects compound-eye processing. Ocellar…
Recent research has shed light on the role of bumblebee dorsal ocelli in regulating the visual system's response to varying light conditions. Through behavioral tests and multi-site local field potential recordings, scientists found that ocellar input plays a crucial part in both dim-light navigation and locomotor control under bright illumination. When ocellar input was blocked, the visual system entered a high-power, dark-like state even when exposed to bright light.
The findings suggest that ocelli are vital for adjusting the neural dynamic range of the bee's visual system, ensuring proper orientation in low light and enabling movement control under bright conditions. This regulation is particularly evident in the green-sensitive pathway, which is involved in optic-flow processing and flight-speed regulation.
Despite the ocellar occlusion not affecting UV-sensitive responses, the study highlights the crucial role of ocelli in modulating the visual system's activity in response to luminance changes.
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