Um, Hye-Young. 1999. Patterns of Laryngeal Neutralization: Asymmetry between Glottalization and Aspiration. Linguistics, 7-1, 161-180. This paper addresses the question: do all laryngeal features show the same behavior with regard to the laryngeal neutralization phenomenon? In examining the laryngeal neutralization patterns in languages with both aspirated and glottalized consonants, it is found that in some languages aspirated consonants and glottalized consonants behave differently with regard to the Laryngeal Constraint (Lombardi 1991) when only one laryngeal feature is neutralized. In languages with single-feature neutralization, the syllable-final contrast is always between glottalized and non-glottalized segments: the aspiration contrast is more frequently neutralized in syllable-final position. This paper proposes that the asymmetry between the features [spread glottis] and [constricted glottis] is due to their phonetic properties. Tat is, glottalized consonants have more cues to convey their distinctiveness in syllable-final position than aspirated consonants. The aspirated consonant has difficulty implementing its primary cue, VOT, in syllable-final or preconsonantal position, whereas the glottalized consonant can realize its glottalization in the preceding vowel. The observations made in examining the laryngeal neutralization typology in this paper suggest that phonetically-motivated constraints are needed for the explanation of the laryngeal feature distribution. (Korea University)