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. Author manuscript; available in PMC: 2012 Aug 1.
Published in final edited form as: J Speech Lang Hear Res. 2011 Feb 4;54(4):1211–1223. doi: 10.1044/1092-4388(2010/09-0218)

Figure 4.

Figure 4

Fitted three-dimensional response surface for NH listeners’ / ʊ / response (left) and corresponding two-dimensional projection onto the F2 × F3 stimulus space (right). Lines on both plots indicate, in 0.1 steps, formant values for which the predicted response probability is equal.