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The mean matters: Effects of statistically defined nonspeech spectral distributions on speech categorization
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10.1121/1.2354071
/content/asa/journal/jasa/120/5/10.1121/1.2354071
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/5/10.1121/1.2354071

Figures

Image of FIG. 1.
FIG. 1.

Stimulus structure and results of experiment 1. (a) Schematic illustration of the experiment 1 stimulus structure based on the paradigm of Holt (2005); (b) a representive stimulus spectrogram from each of the eight conditions; (c) listeners’ average “ga” categorization responses to the /ga/ to /da/ series stimuli in the context of preceding high and low mean acoustic histories with 1 tone at the mean frequency, 3 tones sampling around the mean frequency, 7 tones sampling around the mean frequency, or 21 tones sampling around the mean frequency; and (d) average “ga” categorization responses collapsed across the target stimulus series as a function of the distribution characteristics of the acoustic history precursors.

Image of FIG. 2.
FIG. 2.

Spectrograms of five representative speech target stimuli along the nine-step series.

Image of FIG. 3.
FIG. 3.

Stimulus structure and results of experiment 2. (a) Schematic illustration of the experiment 2 stimulus structure; (b) listeners’ average “ga” categorization responses to the /ga/ to /da/ series stimuli in the context of preceding acoustic histories. In the top left panel, the thick, solid lines depict speech categorization in the context of the homogeneous acoustic history conditions for which there was only global regularity. In the top right panel, the dashed lines illustrate categorization in the context of the hetergeneous acoustic histories with an intermediate global mean of and local regularities within 7-tone subelements. The bottom left panel combines the data from the two former graphs. The bottom right panel shows the data as a function of the frequency of the distribution mean of the final subsequence immediately preceding the speech target; and (c) average “ga” categorization responses collapsed across the target stimulus series as a function of the distribution characteristics of the acoustic history precursors.

Image of FIG. 4.
FIG. 4.

Stimulus structure and results of experiment 3. (a) Schematic illustration of the experiment 3 stimulus structure; (b) example spectrograms illustrating a high mean and a low mean stimulus token from the notched noise and tone acoustic histories of experiment 3. Note that the tone acoustic histories possess energy where the notched noise acoustic histories lack energy. (c) The left panel illustrates listeners’ average “ga” categorization responses to the /ga/ to /da/ stimulus series as a function of the tone acoustic history contexts. The right panel shows the same listeners’ responses to the same speech stimuli preceded by notched noise acoustic history contexts. (d) Average “ga” categorization responses collapsed across the target stimulus series as a function of the distribution characteristics of the acoustic history precursors.

Image of FIG. 5.
FIG. 5.

Stimulus structure and results of Experiment 4a. (a) Schematic illustration of the experiment 4a stimulus structure; (b) example spectrograms illustrating a high mean stimulus token from each experiment 4a condition. Low mean conditions (not illustrated) follow the same pattern across conditions. (c) Listeners’ average “ga” categorization responses to the /ga/ to /da/ series stimuli in the context of preceding high and low mean acoustic histories are plotted for each of the seven conditions of Experiment 4a. The bar graph in the lower right corner illustrates the same data collapsed across speech target stimulus.

Image of FIG. 6.
FIG. 6.

Stimulus structure and results of Experiment 4b. (a) Schematic illustration of the experiment 4b stimulus structure; (b) example spectrograms illustrating a high mean stimulus token from each experiment 4b condition. Low mean conditions (not illustrated) follow the same pattern across conditions. (c) Listeners’ average “ga” categorization responses to the /ga/ to /da/ series stimuli in the context of preceding high and low mean acoustic histories are plotted for each of the five conditions of experiment 4b. The bar graph in the lower right corner illustrates the same data collapsed across speech target stimulus.

Tables

Generic image for table
TABLE I.

Summary statistics for individual conditions.

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/content/asa/journal/jasa/120/5/10.1121/1.2354071
2006-11-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The mean matters: Effects of statistically defined nonspeech spectral distributions on speech categorization
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/5/10.1121/1.2354071
10.1121/1.2354071
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