The topic may be worth some in-depth discussion. Some obvious questions:Travis B. wrote:I was not necessarily saying that there is synchronically a vowel length distinction in all present dialects that split /ai̯/ into /aɪ̯/ and /əɪ̯/, just that such may have existed at the time the split originally occurred, and that it would explain away any need to remember historical forms without surface realizations.Nortaneous wrote:I'm not.Travis B. wrote:This is slightly off-topic, but it may have been somewhat different. I am used to there still being a remaining preceding vowel length difference between unstressed intervocalic /t/ and /d/, indicating that the two phonemes are not truly neutralized, even when unstressed intervocalic /t/ is fully voiced.Salmoneus wrote:To give an example: the raising of /aI/ to /VI/ in some north american dialects has taken place AFTER the neutralisation of the intervocalic T-D contrast that conditions that change! On the surface level, there's just a flap, but speakers are able to recognise the underlying phoneme and raise or not raise the preceding vowel accordingly.
Of course this would be harder to explain if we could find dialects that both have this split and preserve historical vowel length, i.e. have never developed allophonic vowel length in the first place. Then we would have to go back to what Sal was saying.
(1) For retrogrades like me, the idea that a shift in pronunciation may depend on (telepathically transmitted?) underlying forms is still too odd. What can be considered a strong evidence favoring it, in this case? Is there indeed any evidence of that sort?
(2) At a glance, the difference in vowels with pairs of words like writer vs. rider looks just faithfully historical, i. e. reflecting a positional development whose conditioning factors (ultimately associated with voicedness of the consonant) were lost relatively recently. Is there anything strongly contradicting such analysis?
(3) On the other hand, forms like writer and rider can be easily affected by analogy. How much material is there on "Canadian rising" in unanalyzable forms with flapped [t ~ d]?
(4) And, of course, phonetic detail. There must have been tons of research in instrumental phonetics around "Canadian raising" - what's going on with vowel length (like Travis suggested), phonations, intensity curves, whatever?




