Fig. 2. Extracellular recordings of motor outputs from the first lateral nerves. (A) Schematic diagram showing configuration of suction electrodes. Right and left first lateral nerves in the same segment were suctioned to record motor activity patterns. (B) Neural activity from the right (R) and left (L) first lateral nerves was synchronized. The distance between broken lines signifies burst duration. The solid circles indicate spikes of large amplitude. (C) Extended recording time from the first lateral nerves. The arrowheads indicate burst activity. (D) At 10^–4 mol l^–1, constant burst activity was observed in comparison with the control condition. The bars above each trace mark the occurrence of a crawling episode.