Fig. 3. (A–E) Double-plot activity histogram (A; day 145–156) and ²-periodogram analysis (B; day 150–154; Sokolove significance line=SSL=² for P=0.01) of another optic lobe-less cockroach (animal ID 13/21; Table 2) shows circadian wheel-running activity (=20.8 h) in constant darkness 148 days after the transplantation. The solid line at day 153 indicates computer failure. (C) The rhythm scan periodogram plot (Q_p/²) over the complete length of the wheel-running recording (day 1–167) detects rhythmic peaks in consecutive 10-day-²-periodograms (rhythmicity) before removal of the remaining optic lobe (day 19–39) and after the transplantation (day 143–151). s.p.l. = single periodogram length. Additionally, rhythmic activity can be seen in the two activity plots, which show the averaged locomotor activity ± S.D. of the animal during the course of a circadian day before (D; day 27–39) and after (E; day 150–154) the transplantation.