Abstract
It is one of the common interests between biologists and robotics engineers to understand the emergence of adaptive behavior. We struggle to realize autonomously adaptive agents in robotics, and should focus on biomimetics based on the neuronal function of animals. In order to understand how animals alter their behaviors on the demand of changing circumstances, I have focused on aggressive behavior in cricket. Cricket battle starts out slowly and escalates into a fierce struggle to establish dominant-subordinate relationship. Pharmacological experiments suggest that nitric oxide signaling mediates octopaminergic system in the brain, which in turn modulates aggressive motivation. In order to understand the mechanisms of group-size dependent aggression, dynamic behavior and neurophysiological models were established based on the results of biological experiments. The models suggests that important mechanism underlying behavior adaptability is a multiple-feedback structure that is composed of feedback loop in the nervous systems and through the social environment.
