Abstract
A forward‐masking paradigm was used to determine masking patterns for a tonal masker both with and without a second, suppressing tone. The masker was 2000 Hz at 50 dB SPL, the suppressor was 2270 Hz at 70 dB SPL, and the signal was one of eight frequencies in the range from 1825 to 2200 Hz. The duration of the masker and suppressor (when present) was 200 ms and that of the signal 20 ms. Both were gated with a rise‐decay time of 10 ms, and the signal followed the masker immediately. The procedure was single‐interval forced choice with feedback. Complete sets of data were collected for both the left and right ears in a counterbalanced series. The masking patterns determined for the masker alone and for the suppressor alone are reasonably similar across and within subjects. Those determined with masker plus suppressor, however, not only differ markedly across subjects, they are often quite different for the two ears of the same subject. This asymmetry will be discussed in relation to the various proposed explanations of lateral suppression. [Work supported by a Research Grant from NINCDS.]
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