An intrinsic oscillator underlies visual navigation in ants

Area of Science:

• Neuroscience
• Animal Behavior
• Locomotion

Background:

• Insects exhibit lateral oscillations during movement, but their function in visual navigation is not fully understood.
• The neural mechanisms underlying these oscillations and their role in optimizing movement remain largely unexplored.

Purpose of the Study:

• To investigate the production and function of lateral oscillations in visually navigating ants.
• To determine if these oscillations are conserved across different ant species and navigational contexts.
• To explore the neural basis of this motor pattern using a computational model.

Main Methods:

• Observational studies of ant locomotion during visual navigation tasks.
• Comparative analysis across two phylogenetically distant ant species.
• Development and analysis of a neural circuit model of the lateral accessory lobe.

Main Results:

• Visually navigating ants exhibit regular lateral oscillations coupled with forward speed variations, optimizing distance covered and enabling visual scanning.
• This endogenous motor pattern is conserved across different navigational contexts and ant species.
• Oscillation amplitude is modulated by innate and learned visual cues, influencing exploration/exploitation balance.
• A simple neural circuit model of the lateral accessory lobe can reproduce the observed dynamical signature.

Conclusions:

• Insect lateral oscillations are a fundamental motor pattern that optimizes navigation and simplifies behavioral control.
• This low-level motor pattern is generated endogenously and is conserved across species.
• Oscillations provide a simple yet effective neural control mechanism, suggesting they are an ancestral mode of insect movement.