bradrn wrote: ↑Sat Sep 28, 2019 7:43 pm
Salmoneus wrote: ↑Sat Sep 28, 2019 5:18 pm
Some of the rarest sounds are the linguolabial consonants found in many languages on the island of Espiritu Santo, and some on neihbourhin Malakula (presumably an areal effect, as the Malakula and Santo lanuaes are not particularly closely related within Southern Oceanic). They've also been found in just a handful of other lanuaes in the world.
The weird thin, thouh, is that there's no obvious reason for them to be so rare - they don't involve any awkward or weird tonue movements, and everyone can learn to do them reliably in just seconds - just put your tonue as for /T/, and move the tip forward a little until it touches your upper lip. They're reasonably acoustically distinct - the stops in particular do tend to mere into alveolars, but they're no less distinct than the various dentals, alveolars, postalveolars, all variously laminal or apical, that other lanuaes distinuish. They just... don't seem to occur to people!
For me personally, pronouncing a linguolabial does feel like quite an awkward tongue movement: for dental, alveolar, postalveolar… consonants the relevant part of the tongue only needs to be moved a short distance, but for linguolabials the tip of the tongue must be moved quite a long distance, from behind the teeth to the top lip. Maybe that might go some way towards explaining why linguolabials are so rare, although it could just as easily have nothing to do with it.
But the actual tongue movement is tiny!
If you have your tongue as for /T/, and just push it a milimetre further, you get a lin'uolabial. If you have it as for dental /t/ and push it a couple of milimetres further, you have a linguolabial.
Compared to the tongue motion involved in, say, a subapical retroflex, it's nothing.
And it involves only the tongue-tip - the most dextrous and consciously controlled bit of the speech apparatus - rather than anythin dorsal and weird. And it doesn't involve multiple motions in a defined order, or simultaneous motions, and it doesn't involve anything in the throat or larynx... so compared to most 'weird' sounds, it's incredibly easy.
Try gettin some schoolchildren and teachin them linguolabials, and then teaching them ejectives, pharyngealised retroflexives, faucal voice, velar laterals, nasalised lateral clicks, coarticulated alveolar-velar implosives, and so forth. Linguolabials will be grasped much sooner, I'm sure! And yet linguolabials are rarer than any of these...