In this article, we present a set of experiments in which mobile robots able to visually discriminate between two different objects were developed through artificial evolution. The results obtained by evolving robots in stationary environment showed that evolving individuals, by exploiting sensory-motor coordination, develop an extremely simple and effective solution. The analysis of the results obtained by evolving robots in varying environmental conditions showed that evolving individuals develop a slightly more complex solution that also require an ability to modify the behaviour on the fly by adapting to the current environmental circumstances. Overall, the obtained results show that artificial evolution might lead to the development of simple and effective solutions also in the case of problems that have to be solved in varying environmental conditions.
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