Abstract
Psychometric functions for interaural Δt thresholds were obtained by Yes/No method of constant stimuli from three subjects at three representative sensation levels incorporating selected rms values of unilateral Gaussian stimulus periodicity perturbation or jitter. These functions, whose parameters are external jitter (Je) and SL(y), are characterized by slope in μsec/d′. Data were obtained in relative temporal quiet [d′(Jiy)] and with unilateral jitter [d′(Jty)]. The latter results are well predicted from a simple model rating subject's performance against an internal-noise-free ideal statistical observer attending multiple stimulus presentations. Parameters estimated from the data include: number of stimulus pulses effectively utilized by the subject (Ne, constant across SL, and effective internal noise level (Jiy), inversely related to SL: Ne = (Je)max2/[d′(Jty)2−[(d′(Jiy)]min2], Jiy = d′(Jiy) (Ne12. Considered as a signal-detection task in rms temporal masking, the obtained function slopes [d′(Jty)] may be predicted: d′(Jty) = [(Je2+Jiy2)/Ne]12.
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