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Glottal articulation occurs, in the LaT)'fIX, by the jtLttaposition of the vocal cords. Glottal stop is used in Persian before initial vowels, as in {? ABA)) J. Up to flOW, many articles have been written about the glottal stop in Persian, but still many questio11S remain to be addressed about this segment.
Some authors do not regared the glottal stop as a phoneme in Persian, but it is also used as a phoneme in some contexts. In this article, it has been shown that there are two kinds of glottal stop il1 Persia1l, according to the distribution of glottal stop and compe11SatOl)' lengthening. One of them is an
wulerlyng phoneme and the other one .is the result of the process of
illSertioll. 17ze former has a complete distribution in the onset and the coda of a syllable, but the latter is just found ill the onset at the beginning of a word. If the underlying glottal stop is deleted in the coda, this deletion causes compe11SatoT)' lengthening. The underlying glottal stop is suggested to have a slot in the skeletal tier, but other one does not have this slot in the
skeletal tier.