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. Author manuscript; available in PMC: 2019 May 31.
Published in final edited form as: J Acoust Soc Am. 2015 May 1;137(5):2870–2883. doi: 10.1121/1.4916690

Fig. 7.

Fig. 7

(A) Correlations between discriminability (|d′|) of vowel pairs and differences between vowels in F1 (ΔF1), F2 (ΔF2), inter-formant distance (ΔIFD) and spectral centroid (ΔSC) for one human listener trained to discriminate [a] and [i]. Correlation coefficients indicated by R2 values. (B) Distribution of correlation coefficients and regression gradients for all participants (n = 13). Naïve and experienced subjects denoted by filled and unfilled markers respectively.