Fig. 6. Switching locomotion direction in 5–40-GAL4 > CsChrimson larvae by targeted local stimulation.

a Histogram of the number of subsequent forward crawls within a detection window of 30 s after stimulation in segments A3–A7 for 3 s. n = 10 larvae, 36 stimulations. b Same as a for backward waves after anterior stimulation. n = 14 larvae, 28 stimulations. c Representative trace of the location of a muscle contraction wave over time (Supplementary Movie 5). Every 10 s, the larva was stimulated for 3 s, alternating between stimulation in more anterior or more posterior regions. The illuminated segment is indicated in blue. d, e Statistics of switching behaviour for d posterior stimulation (n = 3 larvae, eight stimulations) and e anterior stimulation (n = 5 larvae, nine stimulations). Light intensity: 15 µW mm⁻².