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Responses of 27 phonetically naive listeners to the

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Unformatted text preview: of times each stimulus was heard as /d/. -��---------� Rate of formant movement /w-b/ Illustrations of the spectrographic patterns used to produce the stimuli of Experiment I. The first four patterns in each row show how the tempo of the transitions was varied. At the extreme right of each row is a complete stimulus pattern, i.e, transition plus steady-state vowel, for the longest duration of transition tested. 2400 10 20 b �- w� -u�series 30 40 300 msec. Frequency in CPS 1800 1200 600 0 g �- j �- i�series 2400 1800 1200 10 20 30 300 msec. 40 600 0 Time in msec. 100 80 Judgments in percent 100 80 b g 60 60 40 40 20 20 g �vs. j � b � vs. w� 0 0 30 60 90 120 0 0 30 60 90 120 Transition duration in msec. The distinction between stop consonant and semivowel as a function of the tempo of transition. These curves show the percentage of stop consonant responses, and are based on the judgments of separate groups of 59 and 60 listeners for the b-w and g-j distinctions, respectively. Tempo is here expressed in terms of duration. Example of categorical perception Illustrations of the spectrographic patterns from which the stimuli of the experiment were produced. Pattern 14, at the lower right, is complete in all respects. Efple o Frequency in CPS 1 &teocrcal prepton 2 I 3 4 5 6 7 6 5 4 3 2 7 2400 C 2400- 1800 r '00M r_ Am AM r_ )t= /PE A Im r~ _ I_ I z 1800- 1200 O 1200' z w 600 n 600- 0 I n.- IL. 8 _ 8 9 9 10 10 _ __ 11 11 12 12 13 13 14 · 14 -2400 -1800 -I r TIME IN MSEC. Time in msec. V 1200 -600 ~~~~~~~~~~~~I_ 1800 -1200 s-I 2400 600 __ U ,{4S- 0 300 Figure 10.1 Illustrations of the spectrographic patterns from which the stimuli of the experiment were produced. Pattern 14, at the lower right, is complete in all respects. Identification Data 75 b d g 50 25 0 100 Percent Correct Percent Identification 100 75 50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Two-Step Discrimination 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Stimulus Value Value of "A" Stimulus Obtained Predicted 100 75 75 50 25 0 One-Step Discrimination 1 2 3 4 5 6 7 8 9 10 1112 13 Value of "A" Stimulus Percent Correct Percent Correct 100 50 25 0 Three-Step Discrimination 1 2 3 4 5 6 7 8 9 10 11 Value of "A" Stimulus Labeling and discrimination data for a single S, CD. The values given on the ordinates in terms of percentage are based on 32 and 42 judgments for the labeling and discrimination data, respectively. �_____ -IV\ecau adift-L o e tlIWP-- IOAAu, 1 ( FREQUENCY IN CYCLES PER SECOND Figure 4.30 The upper curve plots the width AF of the critical band as a function of the center...
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