Bumblebees display characteristics of active vision during robust obstacle avoidance flight

Area of Science:

• Insect flight dynamics
• Animal behavior
• Neuroethology
• Biomechanics

Background:

• Insects, particularly bumblebees, exhibit exceptional flight capabilities in complex environments.
• Understanding the sensorimotor strategies behind insect navigation is crucial for advancements in robotics and biomimicry.

Purpose of the Study:

• To investigate the visuo-motor strategies employed by bumblebees for obstacle detection and collision avoidance during free flight.
• To elucidate the role of active vision and head stabilization in navigating cluttered environments.

Main Methods:

• Tracking of bumblebee head and thorax movements during flight in a tunnel with vertical obstacles.
• Analysis of visual cues, including head stabilization, gaze-flightpath alignment, and relative retinal expansion velocity (RREV).
• Correlation of evasion maneuvers with RREV and obstacle proximity.

Main Results:

• Bumblebees demonstrated active vision by stabilizing their heads and aligning gaze with their flightpath.
• Head stabilization enhanced motion contrast, facilitating obstacle detection.
• Avoidance responses were modulated by RREV, with maximum evasion acceleration linearly related to RREVmax.
• Collision avoidance was achieved through rapid thoracic roll maneuvers.

Conclusions:

• Bumblebees utilize a sophisticated combination of active vision and motor control for navigating cluttered environments.
• Head stabilization and RREV-based modulation of evasive actions are key sensorimotor strategies for collision avoidance.
• These findings offer insights into the principles of visually guided flight in insects.