06 July 1990
Vol 249, Issue 4964

About The Cover

Chirp entrainment by the katydid Mecopoda to periodic acoustic stimulation at two different stimulus intensities: plots obtained by iteration of the Poincaré map. The abscissa represents input stimulus rate and the ordinate, phase. At each stimulus rate the map was iterated 50 times: the first 10 iterations are represented by yellow dots while the last 40 iterations (steady-state) are shown in red. The plots identify regions of phase-locked response. See page 55.