(Color online) Durations of tone-burst stimuli used at different frequencies. Four sets of stimulus durations were used in this study. In the first set (filled symbols), the duration (
to) of the tone-bursts varied with frequency (
fo) according to
In the additional three sets (open symbols), the stimulus duration was held constant over a two-octave frequency range. Specifically, the constant stimulus duration of 4.00 ms was used for frequencies of 0.5–2 kHz, 2.83 ms was used for 1–4 kHz, and 2.00 ms for 2–8 kHz. Stimulus rise time is half the stimulus duration.