Figure 4. Mean occupancy in different zones of a concentric circular arena.

A. An arena was constructed with internal concentric walls. For analysis, the arena was subdivided into 4 zones: zone 1, zone 2, zone 3, and zone 4. B. The behavior of flies was examined in the concentric circle arena. The mean occupancies in four different zones, both from simulations and experiments, are shown. Drosophila showed a preference for the outermost zone. The times spent in these zones by Drosophila were statistically similar to that from the two-component model.