Figure 2.

Trajectories of fruitflies walking on the floor of cylindrical arenas (25 mm diameter) shown for three consecutive 33 s periods. The video still-images show the positions of the flies at the start of each period. The position of the head at the start of the period is shown by a dot. The large red circle marks the edge of the arena floor. The flies travelled significantly farther during each period in the pseudo-weightless arena (0g*) than in normal gravity (1g and 1g*). The flies travelled shorter distances in pseudo-hypergravity (2g*). The vectors x and y lie in the horizontal plane, perpendicular to the magnetic field and the direction of gravity (z). (Online version in colour.)