Abstract
Differential thresholds for frequency at 40 dB SL and at octave intervals from 125 cps to 8 kc/sec, were measured using the method of constant stimulus differences with two procedures. In one case, following the usual practice, both the standard and variable stimuli were presented sequentially in time to the same ear. In the second case, the time sequence was identical but the standard stimulus was presented to one ear and the variable stimulus to the opposite ear. Data previously reported for the situation in which both stimuli are presented to both ears indicate that binaural thresholds are lower than monaural. In contrast to this, the present study shows that an alternate binaural presentation yields significantly higher differential thresholds for frequencies of 250 cps and above. This effect appears to be particularly marked at 8 kc/sec. In addition, the present results support the data of Harris, indicating that monaural differential thresholds at low frequencies are substantially smaller than those reported by Shower and Biddulph. [Supported in part by the National Science Foundation.]
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