Right-Branching vs. Left-Branching

Hello,

I've read that right-branching languages are inherently easier for people
to parse than left-branching sentences.  However, the article where I read
that did not give any sources for it.  I was wondering if there are any
well-known studies that prove that right-branching is easier to parse
than left-branching.

Also, if right-branching has been proven to be easier to parse, then why
are there more SOV (that is, [predominantly] left-branching) languages than
any other type?

- Rob

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