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比较几个语系的相关数据可以看出鼻化特征的转移发生在音节首辅音丛和其后的元音之间。本文总结了迄今为止发现的数据,并针对一套汉藏语做了新的分析。显示这种演化在两个方向同时出现:从辅音声母到其后的元音出现在壮侗语系(台-卡岱语系)、南亚语系、汉藏语系、尼日尔-刚果语系(克瓦语)和印欧语系(凯尔特语)中;从元音向辅音声母的转移出现于苏语。仔细检验演化的条件,带出一条(规则的)不对称性。大多数情况下鼻化特征的转移是从辅音声母到其后的元音。相反方向的有规律的变化常常要附加下面任意一条对鼻音的限制条件:(i)鼻辅音为非音位性(语境可预测);或者(ii)鼻辅音后的鼻元音和口元音的对立发生中和(更倾向于鼻元音)。
Comparing data from several language families, one can see that the shift in nasalization occurs between the syllable consonant and the vowel behind it. This article summarizes the data so far discovered and makes a new analysis of a set of Chinese-Tibetan language. It shows that this evolution appears in both directions at the same time: the consonants from the initial consonants to the following vowels appear in the Zhuang Dong language (Tai-Kadai Language Department), the South Asian Language Department, the Sino-Tibetan Language Department, the Niger-Congo Language (Kwa) And the Indo-European language (Celtic); the transfer from the vowel to the consonant initials appears in the Su-so language. Careful examination of the conditions of evolution leads to a (regular) asymmetry. In most cases, the nasal transition is from consonant consonants to subsequent vowels. Regular changes in the opposite direction often require the addition of any one of the following restrictions on nasal sounds: (i) Nasal consonants are non-transopic (predictable context); or (ii) nasal vowels and vowels after nasal consonants Neutralization of Opposition (more likely to nasal vowel).