Examples of duration tuning. A, Short-pass neuron. B, Bandpass neuron. C, Long-pass neuron. Top row, Poststimulus rastergrams illustrating the timing of spikes in response to BEF tone pulses of variable duration presented at 30 dB above BD threshold. Bottom row, Mean ± SE spikes per stimulus as a function of stimulus duration at different sound levels relative to threshold. Note that duration selectivity is relatively stable with changes in stimulus amplitude. A, C, Fifteen trials per stimulus; B, 20 trials per stimulus.