All absolute sound-pressure levels mentioned in McFadden et al. (2010) were, in fact, 8.1 dB weaker than stated because of a malfunction in the true rms voltmeter used to adjust the stimulus levels at the earphones. We regret this error. However, we have no reason to question the basic outcomes; the data simply were collected with weaker stimuli than intended. The overall masker levels in Fig. 1 correspond to spectrum levels of about 17 dB and 7 dB, for the 3.0-kHz [Fig. 1 (top)] and 4.0-kHz data [Fig. 1 (bottom)], respectively, both of which are on the low side of optimal for overshoot according to the data of Bacon (1990).
References
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