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Fig. 5. Spike-traces at different stimulus intensities illustrating response characteristics of the two functional auditory sensory cells A1 and A2. (A) The recruitment of A2 is revealed by spikes with double height or double peaks. In this moth, A2 threshold was +17 dB re A1 threshold. Stimulus pulses: 10 ms, 30 kHz. (B) The mean number of spikes per stimulus (10 stimulations) as a function of intensity relative to A1 threshold (0 dB) from the same moth as in A. The number of A1 spikes per stimulus increases steeply from threshold to approximately +10 dB, where A1 starts saturating before the A2 threshold is exceeded at approximately +15 dB in this preparation. A2 is saturating at intensities greater than +30 dB above threshold.





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