Types of Glottalization
Glottalization varies along three parameters, all of which are continuums. The degree of glottalization varies from none (modal voice, ) through stiff voice and creaky voice to full glottal closure (glottal reinforcement or glottal replacement, described below). The timing also varies, from a simultaneous single segment to an onset or coda such as or to a sequence such as or . Full or partial closure of the glottis also allows glottalic airstream mechanisms to operate, producing ejective or implosive consonants, which (implosives) may themselves have modal, stiff, or creaky voice. It is not always clear from linguistic descriptions if a language has a series of light ejectives or voiceless consonants with glottal reinforcement, or similarly if it has a series of light implosives or voiced consonants with glottal reinforcement. The airstream parameter is only known to be relevant to obstruents, but the first two are involved with both obstruents and sonorants, including vowels.
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