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The discriminability of nearly merged sounds

ABSTRACT In a near-merger, speakers produce two contrasting words differently, without reliably being able to discern the contrast in their own speech or in the speech of others. Acoustic measurements typically reveal small differences between the elements of near-merged minimal pairs along several acoustic dimensions. We argue that statistical evaluation of the potential distinctiveness of these near-merged elements must simultaneously take into account all of these dimensions. For this reason, discriminant analysis is used to assess the differences between near-merged/il–Il/, /el–εl/, and /ul–υl/ for five Utah speakers. In contrast with independent univatiate analyses of variance of F1, F2, f0, and spectral slope, the multivariate discriminant analyses suggest that all three contrasts are preserved by all five speakers. However, hompohones like heel and heal are not distinguished by the discriminant analyses. Discriminant analysis is thus a powerful technique for assessing whether a reliable basis exists for the claim that two potentially contrastive items are in fact distinctive.