Figure 5.

(A) Rhythmic firing of neurosecretory cells and inhibitory responses to onset and offset of illumination recorded from a virgin female with a transected ventral nerve cord. Light and dark periods are indicated by open and solid bars, respectively. Time 0 = 12 h:7 min:8 s. (B) Inactivation of neurosecretory cells by mating. The cells stop firing when an active male touches the tip of abdomen of a female (arrowhead). Small noises are due to vibration produced by flapping of a male at the initial phase of copulation (horizontal bar). (C) Firing pattern of the same neurosecretory cells illustrated in B before and after a 3-h mating (horizontal bar). Light regimes (16-h light/8-h dark) are indicated by open (light) and solid (dark) bars. [Calibration bars = 0.2 mV (A and B).]