We actually just read that paper (and the longer paper first done only
with English) for a discussion group based on my urgings. I just want to
clarify a few points:
The paper was not arguing for Subject/Object/Verb orderings, but of
ordering of semantic information, Actor-Patient-Act, that just happens
to correlate prototypically with grammatical functions. Syntax and
semantics are two different things that relate to each other. Their
conclusions were essentially supporting this: no matter which
grammatical order is default in a language, people make similar
judgements about ordering for non-verbal *semantic* information.
Ultimately, they are talking about aspects of the syntax-semantics
interface (again, on this point I recommend Jackendoff's "Foundations of
Language").
Their choice of sample languages were made largely because Goldin-Meadow
(whose lab I used to frequent) has colleagues in those other countries
who also do research on Homesign — gesture systems spontaneously
created by deaf children born to hearing parents who don't otherwise
learn a sign language. The evidence from homesign systems is that
regardless of culture, they have a preference for Actor-Patient-Act.
This is not SOV because there is no syntax in homesign.
Sign languages have no correlation to the verbal languages of the
culture they belong to. They are wholly independent systems that have no
bearing on each other. If I recall, I don't think that they were arguing
that sign languages are predominantly SOV anyways — their argument is
that for these transitive concepts, there are semantic preferences for
orderings that are independent of language orderings.
I recommend also reading the all English study that this was based on,
that has a lot more detail:
Gershoff-Stowe, L., & Goldin-Meadow, S. (2002). Is there a natural order
for expressing semantic relations? Cognitive Psychology, 45, 375-412.
Best,
Neil