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. Author manuscript; available in PMC: 2015 Jun 30.
Published in final edited form as: J Speech Lang Hear Res. 2011 Aug 23;54(6):1667–1681. doi: 10.1044/1092-4388(2011/09-0279)

Figure 1.

Figure 1

Endpoints of the two-formant AF series and two virtual F1 series (VF1.1, VF1.2) used in Experiment 1 for the /ʌ/-/ɑ/ vowel pair. For each VF1 series, the frequencies of individual sine waves remained unchanged. The intensities of the sine waves pairs were varied systematically in ten steps.