Editor for this issue: Danielle St. Jean
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I've been working on a project involving perceptual confusability between /f/ and /theta/ in various contexts. One of the starting points of this project was the observation that diachronic /theta/ to /f/ sound changes are well-attested (e.g. many current world Englishes), but /f/ to /theta/ sound changes seem to be non-existent.
So, I'm curious whether anyone knows of any examples of a diachronic /f/ > /theta/ change, in any phonological environment. I would also be interested to hear about any synchronic /f/ ~ /theta/ dialect variation, where /f/ has become /theta/ in the innovative dialect.