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Yost [J. Acoust. Soc. Am. 78, 901–907 (1985)] found that detectability of a 20‐ms dichotic signal (Sπ) in a 20‐ms diotic noise (No) was not affected by the presence of a 500‐ms dichotic forward fringe (Nπ). However, Kollmeier and Gilkey [J. Acoust. Soc. Am. Suppl. 1 74, S39 (1982)] varied the onset time of a 20‐ms Sπ signal in a 750‐ms noise that switched, after 375 ms, from Nπ to No, and found that the Nπ noise reduced detectability even when the signal was well into the No noise. They concluded that the Nπ noise acted as a forward masker. The present study investigates detectability of a 500‐Hz, 20‐ms Sπ signal in a 20‐ms No masker as a function of the signal onset time. The masker is preceded by quiet or an Nπ forward fringe and followed by quiet, an No, or Nπ backward fringe. Overall, the results are compatible with a forward masking interpretation. Further, when the signal onset is simultaneous with the onset of the 20‐ms masker, the Nπ forward fringe reduces detectability. [Work supported by NSF and... |
