Figure 2.

Schematic of the stimuli used. Masker (M) level at threshold for the signal (S) was measured using the FDMC method. Off-frequency or on-frequency masker-plus-signal total duration was always 25 ms, and the masker-signal temporal interval was fixed at 0 ms. Signal steady-state portions varied in complement to masker steady-state durations. A precursor was presented before the FDMC combined masker-signal stimulus. The precursor was presented before the masker at levels of 20, 40, 60, and 80 dB SPL, with silent temporal intervals between precursor offset and masker onset of 0, 50, 100, and 200 ms. Double-headed arrow indicates the masker stimulus that was adaptively varied in each stimulus trial.