Figure 2
Mean activity time of the American cockroach (N = 29 for controls and RESF, N = 16 for 5 G test). The main plot shows the time a cockroach spends in motion (translating or rotating), averaged over all measured cockroaches. The curves are obtained by connecting points showing the mean activity time in the preceding 5 min time interval. The inset shows the mean accumulated activity time, i.e. the sum of the mean activity times over 12 h interval of the experiment. In the control runs the geomagnetic field is not modified, RESF stands for test runs with rotated Earth-strength field and 5 G test denotes experimental runs with horizontal compotent of the geomagnetic field rotated and its magnitude increased to 5 Gauss. The error bar is the standard error. *p value = 0.028 (t test against controls), **p value = 0.222 (t test against controls).
