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Overview of the masking conditions: no masker (NM), single-pulse masker (SPM), low-rate pulse train masker (LTM) at 250 pps, and high-rate pulse train masker (HTM) at 5000 pps. Pulse train maskers were presented at the same physical current level (Φ) or at the same psychophysical loudness (Ѱ). SPM was presented at current levels equal to those of LTM. The masker-probe interval (MPI; here, 100 ms) was varied as an experimental condition.
