One of the common problems of golden age science fiction was that they often involved a race of aliens that would have to engage humans in some kind of conversation as a preface to an invasion of Earth. Of course things like universal translators are in fact impossible and so the common plot device was that the aliens could communicate with telepathy (in the anthology series this sometimes happened more than once in a single issue.) I am not a psycho-linguist (in fact I am not even sure if that is a term) but even with telepathy I think that something is lacking in the ability to communicate effectively unless for instance specific parts of the brain are being manipulated in some way to elicit a specific response. This is kind of related to the transfer of intelligence being such an impossible idea as well, as it would be effectively impossible to take someone's consciousness and transfer it to another person's unless they had the exact same structure of the brain. Thus with unilingualism (yay! another made up word!) the most realistic way to achieve instant communication between two individuals is essentially by magic (just as it was with transferred intelligence. This actually showed up twice this week in comics that I read - Sword of Sorcery (the Amethyst story) and in warlord of Mars Dejah Thoris. In both cases a more mystical approach is taken to bridge the language barrier from complete ignorance to completely fluency. It is a strange concept though, just as with transferred consciousness it is a plot device that usually shows up in a science setting but belongs firmly to magic. As a person very interested in science though it is always hard for me to admit that something is so far out of the realm of possibility that it is more easily explained with magic than with reason.