Figure 4.
Synchrogram of a full frequency sweep. Relative phase Ψ(tk) between stimulation and wingbeat. We stimulated with a frequency sweep from 0.1 to 500 Hz with 10 V applied piezo voltage. The baseline frequency of the fly was 209 ± 4 Hz. The continuous recording is shown divided in three rows for clarity. Phase-locking leads to the occurrence of horizontal or weakly tilted lines of phase points; for identified lockings of more than 100 wingbeats the corresponding Arnol'd tongue order n : m is indicated on top. Arrow indicates phase slip at 2 : 1 locking.