有關鼻語支的CVQ 音節在歷史音韻學上的聲調發展• Matisoff 曾以假設的有聲前綴子音系列對此問題發表過論點，並以此假設來解釋sVQ 音節的聲調發展。本文作者認為，前者事實上可以簡單化，並以類型學上常見的解釋來取代舊的學說，詳見聞雅客(2005) 。而解釋sVQ 音節聲調發展也同樣可以用更簡單的辦法來取代。本文提出的新論點可以進一步解釋、RVQ 音節。此外，其他幾種音節的歷史發展，不管是開頭聲母或前綴，也同樣可利用心的聲調發展來解釋。所以本文提出的論點比Matisoff 的方法更簡單，應用的範圈也更為廣大。

Matisoff hypothesized a system of voiced initials governing register shift incertain Yipoic (Loloish) syllables of the CVQ-type. Along the lines of my 2005 paper-where 1 argued such a hypothesized system is not needed to explain the reflexesseen in modern Yipoic languages-here, 1 argue that such a system is not necessaryto account for register shift seen in some Yipoic words of the type s VQ, either. Thispaper suggests that such register shifts are due to the initial s- itself, and that thiseffect is also seen in the 'sRVQ句Tpe syllable and even in some other syllable types.That all these shifts can be connected to the influence of initial s- (or a similar voicelessfricative) is an attractive simplification of the historical phonology of the Yipoicgroup