A bit more than 11 years ago I wrote ("HVPT", 7/6/2008):
At the recent Acoustics 2008 meeting, I heard a presentation that reminded me of a mystery that I've been wondering about for nearly two decades. The paper presented was Maria Uther et al., "Training of English vowel perception by Finnish speakers to focus on spectral rather than durational cues", JASA 123(5):3566, 2008. And the mystery is why HVPT — a simple, quick, and inexpensive technique for helping adults to learn the sounds of new languages — is not widely used.
In fact, as far as I can tell, it's not used at all. Over the years, I've asked many people in the language-teaching business about this, and the answer has always been the same. It's not "Oh yes, well, we tried it and it doesn't really work"; or "It works, but the problems that it solves are not very important"; or "I'd like to, but it doesn't fit into my syllabus". Rather, their answer is some form of "What's that? I've never heard of it."
The "nearly two decades" then extended back from 2008 to a 1991 JASA paper, which is now more than 28 years old: J. S. Logan, S. E. Lively, and D. B. Pisoni, "Training Japanese listeners to identify English /r/ and /l/: A first report". And recently, Ron Thomson sent me a link to a 2018 review article that starts by quoting my 2008 blog post — "High variability [pronunciation] training (HVPT): A proven technique about which every language teacher and learner ought to know", Journal of Second Language Pronunciation.
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