Flies adaptively control flight to compensate for added inertia

Area of Science:

• Neuroscience
• Biomechanics
• Animal Locomotion

Background:

• Animal locomotion exhibits remarkable flexibility, but the interplay between mechanics and neural control is not fully understood.
• Maintaining performance under changing mechanical loads, such as altered inertia, is crucial for stable locomotion, especially in flying animals.

Purpose of the Study:

• To investigate the capacity and flexibility of flight neuromechanics in response to mechanical loading.
• To understand how fruit flies (Drosophila) adapt their motor control to added inertia.

Main Methods:

• Utilized a virtual reality arena to allow fruit flies to rotate freely around the yaw axis.
• Added inertia to flies and analyzed their visuomotor gain, damping, and saccade responses using a control theoretic framework.

Main Results:

• Increased inertia led to a longer response time but did not significantly impair gaze stabilization.
• Flies adaptively modulated visuomotor gain and damping to maintain stability.
• Saccade torque increased to compensate for added inertia, contrasting with mathematical predictions.

Conclusions:

• Fruit flies demonstrate significant neural plasticity to maintain flight performance under altered mechanical conditions.
• Adaptive neural control allows compensation for added inertia, though overall closed-loop flight robustness decreases.
• This study underscores the adaptability and capacity of motor control systems in flight.