(Color online) Wave forms of the stimuli of normal duration of /ʃ/ in “shape” (top) and (bottom), which is the longest /ʃ/ in the present experiment. The experimental phrase, “These take the shape of a long round arch” was taken from the first paragraph of the Rainbow Passage (Fairbanks, 1960).
(Color online) The screen of the PROSLIDER version 1.0. The arrow was set at middle (50) (see Sentence 1) for each listening trial. When listeners perceived a stimulus as stuttering, they were instructed to move the arrow to the top (100) (see Sentence 2). When they perceived a stimulus as fluent, they were instructed to move the arrow to the bottom (1) (see Sentence 3). Once listeners placed the arrow at the desired rating location and clicked CONFIRM, the number and the arrow disappeared (see Sentence 4).
Mean perceptual ratings for all durations of stimuli.
Perceptual ratings by male and female listeners for each of the 20 sound durations. There was one gender difference in perception of sound prolongations. Males rated the phrases with /ʃ/ sounds higher than females at the first quartile, but females rated the phrases with /ʃ/ sounds higher than males at the fourth quartile. However, the steepness of slopes at the 50% crossover was not significantly different between males and females.
Average ratings of the listeners at each duration point.
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