Published online by Cambridge University Press: 24 February 2009
Most languages with labial-velar stops (i.e. // and /
/) have both the voiced and voiceless versions, but several dozen languages have only /
/ or only /
/. Examination of the stop inventories of such languages reveals that in languages which have only /
/ there are always other gaps in the stop inventory, but languages which have only /
/ usually have a full set of other stops, showing that there is a different historical mechanism involved. Also, ‘/
/-only’ languages are more common than ‘/
/-only’ languages, despite the cross-linguistic tendency to favour voiceless stops. Comparative studies show that ‘/
/-only’ languages are often a result of a merger of *
and *
into /
/. I propose that this merger is a result of three phonetic characteristics of the phonologically voiceless /
/, qualities typical of voiced obstruents. Since *
is already partly in the ‘voiced camp’, I hypothesise that hearers interpret it as voiced.