Fig. 4.

Signal plasticity during entrainment to conspecific and artificial signals. Response of five males entrained to different pacers gradually increasing in rate: a solo chirp, a chorus signal and artificial signals consisting of either 2 or 4 “Mecopoda syllables”. The duration of chirps is plotted as a function of the time difference between pacer onset and chirp onset (Δt). Red arrows indicate extraordinary long chirps following the end of the entraining signal after synchrony was lost (see one example in b). c Chirp duration of six males entrained to a repetitive conspecific signal randomly timed within a signal period of 2.0 ± 0.3 s as a function of Δt