Discrimination of increments in the rms level of either the initial or final consonant noise burst of the word (pæt/) was measured for seven highly trained, normal‐hearing listeners. The stimulus was a single token of /pæt/ produced by a female talker and digitized at 20 kHz. The noise bursts’ sample points were multiplied by (1+k), 0.025≤k≤4.1, to obtain rms‐level increments ranging from 0.2–14.0 dB. Experiment I (n=4) compared discrimination performance for noise bursts presented either ‘‘in isolation’’ (i.e., excerpted from the word) or in word context. A constant‐stimulus 2IFC procedure was employed. Level discrimination thresholds expressed as 20 log (1+k) were 2.0–3.0 dB for both the /p/ and /t/ bursts ‘‘in isolation.’’ Thresholds ‘‘in context’’ were 2.0 dB for /t/ and 5.0–7.0 dB for /p/. Experiment II (n=3) compared level‐discrimination performance measured in four different tasks for /p/ or /t/ bursts presented ‘‘in context.’’ The tasks were (a) 2IFC with a single standard (/pæt/); (b) 2IFC with three standards (/kæt, pæk, pæt/); (c) single interval, single standard; and (d) single interval, three standards. A strong context effect was again obtained with the /p/ burst, but the effects of task and number of standards were small. [Supported by OCAST Grant HSO‐005 and Presbyterian Health Foundation.]
Level discrimination of stop‐consonant noise bursts: Performance in single‐ and two‐interval tasks with single and multiple standards.
Michele R. Miller, Blas Espinoza‐Varas; Level discrimination of stop‐consonant noise bursts: Performance in single‐ and two‐interval tasks with single and multiple standards.. J. Acoust. Soc. Am. 1 October 1991; 90 (4_Supplement): 2363. https://doi.org/10.1121/1.402109
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