J. Neurosci. -- Schwartz et al. 23 (18): 7160 Figure IG4

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Figure 4. Statistical structure of speech sounds in Farsi, Mandarin Chinese, and Tamil, plotted as in Figure 2 (American English is included for comparison). The functions differ somewhat in average amplitude, but are remarkably similar both in the frequency ratios at which amplitude peaks occur, and the relative heights of these peaks.