The aim of current study is to examine 9-months old infants’ sensitivity to the phonotactic pattern of their native language

to investigate whether they can sense the difference between word-endings with tense and lax vowel. It was predicted: since 9-months olds were assumed to be able to use phonotactic cues to segment words and most English words are ending with tense vowels

there will be a preference to words ending with tense vowels. Participants in this study are 9-month old infants

using head-turn preference system to examine their listening time to stimuli. Unfortunately

the outcomes did not agree with the hypothesis

which the difference between listening time is too small to accept.