Presents the preliminary results from work in progress of a paired study of the acquisition of voiceless stops by Spanish speakers leaning English and American English speakers learning Spanish. For this study, the hypothesis was that the American speakers would have no difficulty suppressing the aspiration in Spanish unaspirated stops; the Spanish speakers would have difficulty acquiring the aspiration necessary for English voiceless stops, according to F.R. Eckman's (1977) markedness differential hypothesis. The null hypothesis was proved. The results also reveal that a simple report of means will not distinguish the speakers and the respective language learning situation; measurements must also include the range of acceptability of VOT (voice onset time) for phonetic segments.
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