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Neither the nostrils nor the mouth originally evolved for breathing. Fish have (two pairs of) nostrils which they use to smell and mouths which they use to eat, but they breathe through their gills. Some lobe-finned fishes (the ancestors to tetrapods) evolved a connection between the posterior nostrils and the oral cavity called choanae. A fossil called ...


4

The closest reason that I know of for such behaviour is simple conditioning! B. F. Skinner conducted some fairly famous experiments with pigeons, where he put hungry pigeons in cages, and randomly administered the food. The pigeons associated the foods arrival with whatever they happened to be doing at the time (be it looking to the right, or bobbing their ...


3

The alternative articulation, called dentolabial, is more difficult to articulate, so it is very rarely used in human language. However, it apparently is common enough in disordered speech to be allocated an ExtIPA diacritic. The reason labiodentals are easier: Humans normally have a slight overbite. When the jaw and lips are in a "neutral" position, the ...


3

I have had a very difficult time finding information that was well-written and what you were looking for. So, I did my best! From what I have read it takes about four months - everyone is a little bit different and some take longer! Those of us with no visual impairment that try to learn it have no advantage and maybe a slight disadvantage with learning ...


1

Although speech production is in generally executed in the cerebral domain, the dysarthria resulting from damage of the vermous is a symptom of the resulting general muscle weakness. So yes, you get slurred speech because your muscles are weak, but the weak muscles certainly aren't ever isolated to speech production.



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