Creatures

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Abstract
This paper gives a technical description of Creatures, a commercial home-entertainment software package. Creatures provides a simulated environment in which exist a number of synthetic agents that a user can interact with in real-time. The agents (known as "creatures") are intended as "virtual pets". The internal architecture of the c reatures is inspired by animal biology. Each creature has a neural network responsible for sensory-motor coordination and behavior selection, and an "artificial biochemistry" that models a simple energy metabolism along with a "hormonal" system t hat i nteracts with the neural network to model diffuse modulation of neuronal activity and staged ontogenetic development. A Hebbian learning mechanism allows the neural network to adapt during the lifetime of a creature. Additionally, both the network architecture and details of the biochemistry for a creature are specified by a variable-length "genetic" encoding, allowing for evolutionary adaptation through sexual reproduction. Creatures, available on Windows95 and Macintosh platforms from late 1996, offers users an opportunity to engage with Artificial Life technologies. In addition to describing technical details, this paper concludes with a discussion of the scientific implications of the system.

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