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Figure 1. Combinations of GPR and SER values used in the experiments on speaker-size discrimination. Discrimination performance was measured at nine points (solid circles) in the single-vowel experiment, and at seventeen points (solid and open circles) in the speech-like experiment. The three ellipses show estimates of the normal range of GPR and SER values in speech for men (M), women (W) and children (C), derived from the data of Peterson and Barney (1952). 90% of individuals in each category would be expected to fall within the respective ellipse.
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