The study investigated vowel insertion in Arabic dialect of Yemen (ADY) by examining the differences that could be observed in the performance of educated and uneducated speakers from different sociolinguistic backgrounds. Spontaneous speech was recorded for thousand and seven hundred Yemeni male speakers (age ranges between 19 and 61 years old) who reacted to a seven-minute video where researchers have targeted words illustrating vowel insertion before they analyze them linguistically and statistically. Outlined results show that dialectal speech of the participants (educated and uneducated) is characterized by final insertion of monophthongs (short and long vowels) and diphthongs (closing) regardless if the plosives are released or not. Compared with educated participants, uneducated participants inserted more vowels and such vowel insertion significantly varies in each dialect under the umbrella of ADY. The study concluded to support the belief that vowel insertion is affected more by linguistic factors than by any other factor
(s). In light of these findings, it was recommended to investigate phonemic changes like vowel deletion, vowel lengthening and vowel substitution to see to what extent they are interacting in the multisyllabic words of ADY. Vowel insertion should also be searched in individuals with voice, speech and language disorders to see what the outcomes of such investigation could add to our psychoneurolinguistic knowledge of understanding these individuals’ linguistic impairments.
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