Whole-cell recordings from interval-counting neurons in H. versicolor that show tuning to pulse rates characteristic of the advertisement call of this species. As in Fig. 5, traces are membrane-potential fluctuations in response to single presentations of the stimuli shown, or averaged responses; the number of spikes and stimulus presentations are shown. The recordings (a–c) represent the range of selectivity for slow-rise pulses, from strong (a) to nonselective (c) Carrier frequencies (BEFs) = a 1200 Hz, 81 dB SPL; b 160 Hz, 69 dB SPL; c 225 Hz (BEF), 61 dB SPL