Portal de Periódicos da CAPES

Stimulus correlates in the perception of voice onset time (VOT): I. Discrimination of the time interval between tone bursts of different intensities and frequencies

1976; Acoustical Society of America; Volume: 60; Issue: S1 Linguagem: Inglês

10.1121/1.2003602

1520-9024

Pierre L. Divenyi, R. M. Sachs, Ken W. Grant,

Acoustic Wave Phenomena Research

In a four-level 2AFC paradigm, trained subjects had to discriminate time intervals that were marked by tone bursts of unequal duration (10 and 100 msec). Time differences discriminable at the d′ = 1 level, ΔTThresh, were determined in the 10–100-msec range of time intervals (onset to onset). When the frequencies and intensities of all markers were held constant (1 kHz and 86 dB SPL), ΔTThresh was a monotonic function of T. This relation became non-monotonic when the level of the first marker was decreased to 36 dB SPL or as the two marker frequencies were made different from each other by two octaves. Thus, a discrepancy in either the level or the spectrum of two time-marker sounds may constitute an acoustic basis for the nonmonotonic VOT discrimination functions, despite the fact that the depth of the local minimum found in the present data is less than that observed in VOT experiments. [Supported by a grant from NINCDS.]