Abstract
Tuning curves were generated using narrow-band (50 Hz wide) noise and sinusoidal maskers for three signal conditions for both simultaneous and forward masking. Tuning curves for a brief (5-ms) 1-kHz sinusoidal signal are compared to those for a longer (35-ms) signal of equal power (38.5 dB SPL) or equal energy (power equals 30 dB SPL). For all three signal conditions, the comparison of sinusoidal and noise tuning curves shows the same relation. In simultaneous masking, noise is a more effective masker near the signal frequency but in the low frequency tail the tuning curves cross and the sinusoid becomes the more effective masker. This reversal is clearly due to the interaction of masker and signal since the difference between sinusoidal and noise maskers disappears in forward masking. Tuning curves in forward masking show greater tuning than those in simultaneous masking with one exception. For the brief signal, there is no difference between the simultaneous and forward masking curves for the noise masker.
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