The acquisition of Spanish word-initial voiceless stops: adult language learners in a communicative program

This study examined the development and acquisition of second language (L2) sounds by adult students enrolled in a communicative language program. The investigation explored the acquisition of L2 phones by analyzing the voice onset time (VOT) of word-initial voiceless stops in Spanish by native English speakers. A total of 40 subjects participated in the study and were divided into three groups; one group of students enrolled in a first semester course, another group of students enrolled in a third semester course, and the last group enrolled in a fifth semester course. The duration of VOT was compared between groups reading from a word list consisting of 60 words during the 13th to 15th weeks of the semester. Significant differences in VOT were found between the first and fifth semester groups, as well as the third and fifth semester groups suggesting that accurate acquisition of L2 phones and the formation of new phonetic categories are possible for late L2 learners in accordance with the Speech Learning Model.