Locusts possess a bilateral pair of uniquely identifiable visual neurons that respond vigorously to the image of an approaching
object. These neurons are called the lobula giant movement detectors (LGMDs). The locust LGMDs have been extensively studied
and this has lead to the development of an LGMD model for use as an artificial collision detector in robotic applications.
To date, robots have been equipped with only a single, central artificial LGMD sensor, and this triggers a non-directional
stop or rotation when a potentially colliding object is detected. Clearly, for a robot to behave autonomously, it must react
differently to stimuli approaching from different directions. In this study, we implement a bilateral pair of LGMD models
in Khepera robots equipped with normal and panoramic cameras. We integrate the responses of these LGMD models using methodologies
inspired by research on escape direction control in cockroaches. Using ‘randomised winner-take-all’ or ‘steering wheel’ algorithms
for LGMD model integration, the Khepera robots could escape an approaching threat in real time and with a similar distribution
of escape directions as real locusts. We also found that by optimising these algorithms, we could use them to integrate the
left and right DCMD responses of real jumping locusts offline and reproduce the actual escape directions that the locusts
took in a particular trial. Our results significantly advance the development of an artificial collision detection and evasion
system based on the locust LGMD by allowing it reactive control over robot behaviour. The success of this approach may also
indicate some important areas to be pursued in future biological research.
Keywords Robots - Escape - Emergent properties - Behaviour - Visual neural network - LGMD - DCMD - Locusts - Jumping - Agents - Hybrid - Cybernetics