Male Moths Cruise For Girls In Robotic Vehicle

Thanks to helpful roboticists, male moths can now drive around in their own robotic vehicle looking for females. It helps to have your own car, believe me.


(Moth now ready to drive its own vehicle)

The male silkmoth was chosen as the 'driver' of the robot due to its characteristic 'mating dance' when reacting to the sex pheromone of the female. Once the male is stimulated by the pheromone it exhibits a distinctive walking pattern: straight-line and zigzagged walking consisting of several turns followed by a loop of more than 360.

Lead author of the research, Dr Noriyasu Ando, said: "The simple and robust odour tracking behaviour of the silkmoth allows us to analyse its neural mechanisms from the level of a single neuron to the moth's overall behaviour. By creating an 'artificial brain' based on the knowledge of the silkmoth's individual neurons and tracking behaviour, we hope to implement it into a mobile robot that will be equal to the insect-controlled robot developed in this study."

The researchers, from the University of Tokyo, attached the silkmoth to a free-moving polystyrene ball at the front of the robot which was used for overall control, much like the ball in a computer mouse.

Two 40 millimetre fans were attached at the front to divert the pheromone-containing air to the on-board moth the researchers believe the fans are comparable to the wings of the silkmoth that flap to generate air flow across its antennae.

A 1800 millimetre wind tunnel was used in the experiments; the pheromone and robot were placed at opposite ends. Fourteen silkmoths were used in the study and all of them were able to successfully guide the robot towards the source.

The researchers also introduced a turning bias to the experiments, changing the power of one of the robot's two motors so it veered towards one side when moving. This put the silkmoth into an extraordinary situation and required it to adapt and change its behaviour.

"The best way to elicit adaptive behaviours of insects is to put them into extraordinary situations. The turning bias in our study is analogous to a situation in which we try to ride unbalanced bicycles. We need training to ride such bicycles smoothly but the silkmoth overcomes the situation with only simple and fast sensory-motor feedbacks," said Dr Ando.

SF author (and computer scientist) Vernor Vinge wrote about a strange race in his 1992 novel A Fire Upon the Deep:

Ravna looked across the surf. When the waves backed down the sand, she could see the Skroderiders' fronds peeping out of the spray... They sat in the surf, thinking thoughts that left no imprint on their minds...

Then some unknown race had chanced upon the dreamers and decided to "help them out." Someone had put them on mobile platforms, the skrodes. With wheels they could move along the seashores, could reach and manipulate with their fronds and tendrils. With the skrode's mechanical short-term memory, they could learn fast enough that their new mobility would not kill them...

Via Odour-tracking capability of a silkmoth driving a mobile robot .

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