KathTheDragon wrote:Well, the triple reflex does directly imply that the three laryngeals remained distinct beyond the breakup of PIE, at least within pre-Proto-Greek, so it is at least thinkable that colouring persisted as well. Also, it does seem that colouring was a synchronic rule, so if the pre-Proto-Greek speakers identified *ə with *e, then colouring (directly to the synchronic phones) is only natural.
Well, either the laryngeals themselves, or some later reflex of theirs.
Nobody would claim that *eh₂ >> Germanic *ō means that syllable-final *h₂ actually o-colored *e in Germanic; this is universally considered to have instead involved a later vowel shift from an intermediate non-PIE vowel *ā. The same approach is possible with "syllabic laryngeals", only with the complication that this time we do not have other languages that would retain clear records of distinct *ə₁ *ə₂ *ə₃.
(Within this approach I would suggest that also correspondences along the lines of *r̥ > Greek
ar ~
or should be assumed to have gone thru an intermediate stage *ə₂r ~ *ə₃r; there does not seem to be any reason to introduce a fourth, "uncolored" schwa.)
KathTheDragon wrote:Latin displays a "triple reflex" in front of syllabic nasals: *(h₁)n̥ > in, *h₂n̥ > an, *h₃n̥ > un, if memory serves.
Oh, that's interesting. Looking up Schrijver's "PIE Laryngeals in Latin" gives e.g.
unguis and
umbilīcus as clear examples of *h₃N̥- >> *oN- >
uN-. This apparently extends to Sabellic as well:
unctus ~ Umbrian
umtu.
Now there's however the complication that Sabellic instead vocalizes *N̥ as
aN (e.g.
inter ~ Oscan
anter < Italo-Celtic *ənter < *(h₁)n̥ter)! So, contrary to what Schriver suggests (the known Latin development *N̥ > *eN taking place before laryngeal coloring), this seems like strong evidence to rather reconstruct here *h₃R̥- > *h₃əR- > *ə₃R-, followed by *ə₃N > *oN (and elsewhere *ə₃ > *ə₂ > a). Laryngeal coloring taking place (or remaining active) until something like early Proto-Greek seems possible at least, but dating it as post-Proto-Italic does not.
KathTheDragon wrote:Are you saying that you think that *h₂ is the most likely to have been a fricative, with *h₁ and *h₃ more likely having been something else?
No, just that the laryngeals are unlikely to have been a set of voiceless back fricatives, fully paralleling the stop series. They very well could have been fricatives, but without forming any kind of a clear triplet. If there is a voiceless (post-, labio-)velar in there, that's most likely *h₂. If we wanted fricative values for the others, something along the lines of h₁ = [h], *h₃ = [ɣ~ʁ] seems fairly reasonable.