Fig. 6. The delay characteristics of M. sexta's flower tracking ability. (A) Latency of response plotted against frequency. (B) Phase of response plotted against frequency, where phase is defined as (latency of response)/(period of flower motion). A value of zero indicates that the moth is perfectly in phase with the flower, while a value of 0.5 indicates the moth is 180° out of phase. The direction treatments are labeled (H, V, L).