Binaural frequency difference limens in noise were obtained under homophasic and antiphasic conditions. Signal frequencies of 200, 300, 500, 700, and 1000 Hz were investigated at 5-and 10-dB sensation levels while 500 Hz was also explored at 15, 20, and 25 dB. The masker was a bandlimited noise with a spectrum level of 55 dB. Results indicate significant changes in discrimination behavior as a function of phase condition and sensation level. Alternative interpretations of the data are considered.
In 1967 at the 74th meeting of the Society, Robertson and Goldstein reported on changes in frequency-discrimination behavior in binaural listening in noise. The findings of that investigation are extended by this study in which binaural frequency-difference limens in noise were obtained for five frequencies: 200, 300, 500, 700, and 1000 Hz. A 275-msec tonal signal of either 5 or 10 dB SL above masked threshold (SLm) was employed under both homophasic (N0S0) and antiphasic (N0Sπ) conditions. A band-limited (100–2100 Hz) white noise with a spectrum level of 55 dB served as the masker. At each signal frequency and SL, the N0Sπ condition yielded larger DL than did N0S0. Two possible interpretations of these results are considered: (1) the larger antiphasic DL is a reflection of the larger bandwidth operative in the antiphasic configuration; and (2) the DL magnitude is dependent on the signal loudness and the larger antiphasic DLs are a reflection of the difference in the loudness growth patterns for each configuration as a function of SLm.
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