ENVIRONMENTAL-EFFECTS ON MINIMAL BEHAVIORS IN THE MINIMAT WORLD

The structure of an environment affects the behaviors of the organisms that have evolved in it. How is that structure to be described, and h ow can its behavioral consequences be explained and predicted? We aim to establish initial answers to these questions by simulating the evol ution of very simple organisms in simple environments with different s tructures. Our artificial creatures, called ''minimats,'' have neither sensors nor memory and behave solely by picking amongst the actions o f moving, eating, reproducing, and sitting, according to an inherited probability distribution. Our simulated environments contain only food (and multiple minimats) and are structured in terms of their spatial and temporal food density and the patchiness with which the food appea rs. Changes in these environmental parameters affect the evolved behav iors of minimats in different ways, and all three parameters are of im portance in describing the minimat world. One of She most useful behav ioral strategies that evolves is ''looping'' movement, which allows mi nimats-despite their lack of internal state-to match their behavior to She temporal (and spatial) structure of their environment. Ultimately we find that minimats construct their own environments through their individual behaviors, making the study of the impact of global environ ment structure on individual behavior much more complex.